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Forums10
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Joined: Oct 2010
Posts: 969 Likes: 38
Sidelock
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OP
Sidelock
Joined: Oct 2010
Posts: 969 Likes: 38 |
I have this neat little 410 peninusla lock Cogswell with a nipple problem. I will try to avoid puns if I can.
The nipple threads are worn so that the nipples can be removed with mere hand pressure.
The obvious repair would seem to be thread restoration with a metric tool and replacing the nipples with Italian ones offered by OMPS (the Italisn equivalent of Brownnells) hence the metric thread choice.
Before I rush where angels fear to tread, anyone have any less radical suggestions? A search on the web re nipples, other than the obvious results, turns up very little info about hammer guns and plenty on muzzle loaders.
Last edited by Shotgunlover; 12/01/17 05:55 PM.
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Joined: Apr 2012
Posts: 753
Sidelock
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Sidelock
Joined: Apr 2012
Posts: 753 |
i would think the only other option is to have the threads area built up with tig welding and recut the threads to match the nipples
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Joined: Dec 2001
Posts: 6,993 Likes: 402
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,993 Likes: 402 |
I would look at SAE threads first. Sometimes when I have a british screw to make and the BA die will not work I can find a ASE thread that is close enough to work. The action body is hard so a slightly over sized soft piece to steel can often be made to conform. Kind of like a push up die works. Neat trick taught to me by a most excellent smith. Once you harden the new nipple threads should plenty strong. I actually just had to do one on a metric thread and used an SAE die to get the new screw started.
Last edited by SKB; 12/01/17 06:55 PM.
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Joined: Feb 2003
Posts: 4,034 Likes: 47
Sidelock
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Sidelock
Joined: Feb 2003
Posts: 4,034 Likes: 47 |
I'd be tempted to try Loctite 'Form-a-Thread' just for grins and giggles. Call it a $20 research project. It could always serve as a negative example.
"The price of good shotgunnery is constant practice" - Fred Kimble
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Joined: May 2011
Posts: 1,071
Sidelock
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Sidelock
Joined: May 2011
Posts: 1,071 |
I'd be tempted to try Loctite 'Form-a-Thread' just for grins and giggles. Call it a $20 research project. It could always serve as a negative example.
There's even a cheaper method--teflon tape on the threads! Have seen this on a few muzzleloaders where the threads were worn.
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Joined: Dec 2001
Posts: 6,993 Likes: 402
Sidelock
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Sidelock
Joined: Dec 2001
Posts: 6,993 Likes: 402 |
Speaking of muzzleloader nipples, every British ML I have ever measured had 1/4" 28TPI threads. Nipples for Muzzle loaders come over size in many different thread diameters such as .255" x 28 or .260" x 28. You might check but if your nipples are 1/4"x28 then starting with an over sized ML nipple might be just the ticket.
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Joined: Jan 2002
Posts: 13,149 Likes: 1147
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 13,149 Likes: 1147 |
Speaking of muzzleloader nipples, every British ML I have ever measured had 1/4" 28TPI threads. Nipples for Muzzle loaders come over size in many different thread diameters such as .255" x 28 or .260" x 28. You might check but if your nipples are 1/4"x28 then starting with an over sized ML nipple might be just the ticket. My thoughts exactly, Steve. SRH
May God bless America and those who defend her.
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Joined: Feb 2002
Posts: 2,859
Sidelock
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Sidelock
Joined: Feb 2002
Posts: 2,859 |
I refreshed an old ML last year to use as a wall hanger/shooter. It came to me with oversized nipple threads. I simply checked the thread diameter with a micrometer and ordered accordingly from Track of the Wolf. The new oversized percussion nipples fit perfectly. Below is a photo of my dog and the gun with a wild pheasant I shot with it this season in Nebraska. The gun is a 13 gauge Belgium made JABC farm implement. Steve
Approach life like you do a yellow light - RUN IT! (Gail T.)
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Joined: Jan 2002
Posts: 737 Likes: 23
Sidelock
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Sidelock
Joined: Jan 2002
Posts: 737 Likes: 23 |
The Teflon tape is the trick. My Greener had the same problem. A few turns of Teflon tape and the problem was solved. I would imagine that blue loctite would work also.
Last edited by Hammergun; 12/02/17 07:09 PM.
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Joined: Jan 2013
Posts: 1,124 Likes: 195
Sidelock
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Sidelock
Joined: Jan 2013
Posts: 1,124 Likes: 195 |
A method that was used in the days of make do and mend to tighten threads mainly because threading of parts could be a little hit and miss to say the least. I have used this but never on a gun but I do not see any reason why it should not be successful. Wrap some fine Copper Bronze or soft Iron wire in the nipple threads this will take up the lateral play in the thread and make things tight again.
The only lessons in my life I truly did learn from where the ones I paid for!
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