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  #1  
Old 04-02-2020, 02:10 AM
rider rider is offline
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Default Cooper 38 issue

Gentleman,
I have a reoccurring issue with the firing pin retaining screw backing out and causing a misfire. Is there a procedure to hold the firing pin while snugging the retaining screw? I am hesitant to use a thread locking compound in case the firing pin should break/or need to be replaced.
Thanks,
Rider
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  #2  
Old 04-02-2020, 05:07 AM
Kevin Gullette Kevin Gullette is offline
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Lightbulb rider.......

Years ago......I used some clear fingernail polish.

Worked pretty well.

Kevin
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  #3  
Old 04-02-2020, 12:38 PM
56S 56S is offline
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There are multiple grades of thread locking compounds. I know with Loctite brand red is considered permanent and blue is serviceable. I think there's a puple for fine threads too. Just don't use red as it takes quite a bit of heat to soften.
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Old 04-02-2020, 01:15 PM
rider rider is offline
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Does anyone have a method to hold the firing pin while snugging the retaining screw?
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Old 04-02-2020, 03:10 PM
SmokinJoe SmokinJoe is offline
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To hold the firing pin in the correct position, I use my borescope to look in the hole, but any good magnifying lens should work. After you get the holes lined up, just install the cone point setscrew and tighten it a little. Next install the second setscrew with a little blue locktite to bind the first one in place. Let it sit for a little while so the locktite has time to set up and you should be good to go. Forgot to say that after you disassemble, make sure to wash all the lubricant off all the pieces so that the locktite will bond to the steel and don't re-lube untill it has time to set.
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Old 04-03-2020, 02:35 AM
rider rider is offline
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SmokingJoe,
I don't know how I missed the set screw in the cocking piece. Pretty obvious!
Thanks,
Rider

Last edited by rider; 04-03-2020 at 03:41 AM. Reason: spelling
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  #7  
Old 04-03-2020, 02:55 AM
SmokinJoe SmokinJoe is offline
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Yes, there should be two setscrews, one is cone point and the point goes into the hole in the firing pin shank, and the other goes in behind it to jam lock it into place. A lot of custom actions are made that way, too. Threw me the first time I disassembled the firing pin assembly on one of my Nesika custom actions.
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Old 04-03-2020, 03:43 AM
rider rider is offline
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The model 38's that I have have only one set screw.
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  #9  
Old 04-03-2020, 12:50 PM
SmokinJoe SmokinJoe is offline
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Thanks for the correction, been awhile since I had my Cooper apart. If that is the case, you need to really degrease it well, then locktite with blue and allow some setup time before lubing/using again. If there is room for another setscrew, I would still recommend getting one and installing it to lock the first one in place but there may not be enough thread depth in that tiny little action to do that.
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