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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe
12mm thread chaser
12mm thread chaser
Anyone have a good source for a 12mm spark plug thread chaser that doesn't cost an arm and leg?
Never mind-Made One
I found a 12 mm bolt with 125 pitch at True Value Hardware. With some careful work with a cut wheel I put three channels in the threads for grease to collect the crude and it worked like a charm. Plugs go in smooth and tight. Cost for the bolt a little over three bucks.
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e3steve
- h305 Moderator
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Had I not been away for my birthday ~ your day of posting ~ that would've been my suggestion; I did the same thing, but with 4 grooves, using a Dremel edge-disc.
Your attack on the problem is the heart of a forum like ours here, giving us all an uplift and the enthusiasm to solve problems with a little lateral thinking.
This type of screw was (is?) commonplace back in the early 70s in (UK) vehicle production, whereby the leading 2 or 3 turns of thread were removed, leaving merely a 'lead-in' location stub; there was a wedge-shaped groove circumventing 90º of the screw and reducing to nothing at about 30% of the threadlength. These 'modifications' were pre-plating/passivation process, and the reason was to allow the leading part of the thread to clean out paint from the prepared bodywork's captive nuts.
Your attack on the problem is the heart of a forum like ours here, giving us all an uplift and the enthusiasm to solve problems with a little lateral thinking.
This type of screw was (is?) commonplace back in the early 70s in (UK) vehicle production, whereby the leading 2 or 3 turns of thread were removed, leaving merely a 'lead-in' location stub; there was a wedge-shaped groove circumventing 90º of the screw and reducing to nothing at about 30% of the threadlength. These 'modifications' were pre-plating/passivation process, and the reason was to allow the leading part of the thread to clean out paint from the prepared bodywork's captive nuts.