{"id":448,"date":"2017-08-17T20:01:12","date_gmt":"2017-08-17T19:01:12","guid":{"rendered":"http:\/\/www.purplemeanie.co.uk\/?p=448"},"modified":"2026-05-28T01:08:16","modified_gmt":"2026-05-28T00:08:16","slug":"build-session-3-tapping-a-poorly-threaded-harness-mount","status":"publish","type":"post","link":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/08\/17\/build-session-3-tapping-a-poorly-threaded-harness-mount\/","title":{"rendered":"Build Session 3 : Tapping a Poorly Threaded Harness Mount"},"content":{"rendered":"\n<p>A simple job today&#8230; when the car arrived there was an obvious problem with the inboard off side harness bolt. The car is set up for 4-point harnesses and it now seems that Caterham, not only pre-attach the hood and the boot cover, they also pre-drill and set up the attachment points for the harnesses.<\/p>\n\n\n\n<p>Many build blogs talk about the process of unstitching the boot cover at the point where the stiffening aluminium (aluminum) bar sits at the front of the boot cover. The bar has to then be removed and the boot cover has the four holes for the harness bots punched in it. Then people typically glue up the unstitched boot cover.<\/p>\n\n\n\n<p>I have none of that to do as Caterham have done it already and has probably saved me a days work with the hood, hood sticks, harness bolts and boot cover.<\/p>\n\n\n\n<p>However, one of the bolts wasn&#8217;t screwed all the way into it&#8217;s thread. A quick tweak of the bolt on arrival day showed that it was binding in it&#8217;s thread and probably was suffering from some swarf or material in the threads.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone is-style-default\"><a href=\"http:\/\/www.purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out.png\" rel=\"attachment wp-att-484\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"338\" data-attachment-id=\"484\" data-permalink=\"https:\/\/purplemeanie.co.uk\/index.php\/2017\/08\/17\/build-session-3-tapping-a-poorly-threaded-harness-mount\/harness-bolt-sticking-out\/\" data-orig-file=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out.png\" data-orig-size=\"1920,1080\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Harness Bolt Sticking Out\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Harness bolt sticking out&lt;\/p&gt;\n\" data-large-file=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out.png\" src=\"http:\/\/www.purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out-600x338.png\" alt=\"Harness bolt sticking out above the carbon cockpit trim.\" class=\"wp-image-484\" srcset=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out-600x338.png 600w, https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out-768x432.png 768w, https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Harness-Bolt-Sticking-Out.png 1920w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption>Harness bolt sticking out<\/figcaption><\/figure>\n\n\n\n<p>After pulling out the callipers and tap\/die thread gauge it became apparent that I was going to need to order a new tap &#8211; the bolt is M11x1.25t\/mm. One was ordered on Amazon and arrived today.<\/p>\n\n\n\n<p>It was then a five minute job to tap out the hole and test fit the bolt &#8211; another job done, 10 minutes.<\/p>\n\n\n\n<figure class=\"wp-block-image alignnone is-style-default\"><a href=\"http:\/\/www.purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread.png\" rel=\"attachment wp-att-485\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"338\" data-attachment-id=\"485\" data-permalink=\"https:\/\/purplemeanie.co.uk\/index.php\/2017\/08\/17\/build-session-3-tapping-a-poorly-threaded-harness-mount\/tapping-out-the-harness-thread\/\" data-orig-file=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread.png\" data-orig-size=\"1920,1080\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Tapping out the harness thread\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Tapping the harness mounting point&lt;\/p&gt;\n\" data-large-file=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread.png\" src=\"http:\/\/www.purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread-600x338.png\" alt=\"Harness mounting point being tapped with a hand tap.\" class=\"wp-image-485\" srcset=\"https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread-600x338.png 600w, https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread-768x432.png 768w, https:\/\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/Tapping-out-the-harness-thread.png 1920w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><figcaption>Tapping the harness mounting point<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Caterham 420R build session covering remedial thread tapping on a harness mount before continuing with the build.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[3,51],"tags":[33,66,76,81],"class_list":["post-448","post","type-post","status-publish","format-standard","hentry","category-caterham-420r-build","category-caterham-blog","tag-build","tag-caterham","tag-caterham-420r-build","tag-interior"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8yl38-7e","jetpack-related-posts":[{"id":1512,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/10\/28\/build-session-30-more-fuel-and-washer-bottle-fitting\/","url_meta":{"origin":448,"position":0},"title":"Build Session 30 : More Fuel and Washer Bottle Fitting","author":"John Martin","date":"October 28, 2017","format":false,"excerpt":"Caterham 420R build session covering further fuel-system work and washer bottle fitting.","rel":"","context":"In &quot;Caterham 420R Build&quot;","block_context":{"text":"Caterham 420R Build","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-420r-build\/"},"img":{"alt_text":"Green earth wire connected with a ring terminal on the chassis.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_1675.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_1675.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_1675.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_1675.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":667,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/08\/25\/email-4-washer-bottle-in-the-boot\/","url_meta":{"origin":448,"position":1},"title":"Email 4 : Washer Bottle in the Boot","author":"John Martin","date":"August 25, 2017","format":false,"excerpt":"Caterham 420R build support email covering washer bottle placement in the boot and related fitment implications.","rel":"","context":"In &quot;Caterham 420R Build&quot;","block_context":{"text":"Caterham 420R Build","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-420r-build\/"},"img":{"alt_text":"Washer bottle installed in the boot with pump and outlet hose attached.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/08\/IMG_8307.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":1267,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/10\/08\/build-session-23-harnesses-seats-and-silencer\/","url_meta":{"origin":448,"position":2},"title":"Build Session 23 : Harnesses, Seats and Silencer","author":"John Martin","date":"October 8, 2017","format":false,"excerpt":"Caterham 420R build session fitting harnesses, seats, and the silencer as the car moves toward a more complete driving position and exhaust setup.","rel":"","context":"In &quot;Caterham 420R Build&quot;","block_context":{"text":"Caterham 420R Build","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-420r-build\/"},"img":{"alt_text":"Side view of the purple Caterham with seats, wheels and silencer fitted.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/11\/7950015C-6B20-4879-A764-763321F6EC0D.jpeg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":269,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/04\/16\/pre-build-update-3-specification-set-garage-finished-and-line-drawings\/","url_meta":{"origin":448,"position":3},"title":"Pre-build Update #3 \u2013 Specification Set, Garage Finished and Line Drawings","author":"John Martin","date":"April 16, 2017","format":false,"excerpt":"Pre-build update covering final specification decisions, garage readiness, and line drawings for the Caterham 420R build.","rel":"","context":"In &quot;Caterham 420R Build&quot;","block_context":{"text":"Caterham 420R Build","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-420r-build\/"},"img":{"alt_text":"Front line drawing of a Caterham Seven with headlights and cycle wings.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/04\/R500-Sketch-Front.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":1452,"url":"https:\/\/purplemeanie.co.uk\/index.php\/2017\/10\/22\/build-session-28-boot-floor-fuel-filler-shroud-and-carpets\/","url_meta":{"origin":448,"position":4},"title":"Build Session 28 : Boot &#8211; Floor, Fuel Filler Shroud and Carpets","author":"John Martin","date":"October 22, 2017","format":false,"excerpt":"Caterham 420R build session covering boot-area assembly, including the floor, fuel filler shroud, and carpets.","rel":"","context":"In &quot;Caterham 420R Build&quot;","block_context":{"text":"Caterham 420R Build","link":"https:\/\/purplemeanie.co.uk\/index.php\/category\/caterham-blog\/caterham-420r-build\/"},"img":{"alt_text":"Finished black boot carpets installed with the rear bodywork still masked.","src":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_3183.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_3183.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/purplemeanie.co.uk\/wp-content\/uploads\/2017\/10\/IMG_3183.jpg?resize=525%2C300&ssl=1 1.5x, 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