Fixable or not?

[Pipe welder John]

You could also, as a last resort, find a good TIG welder to fill the hole completely, then drill and tap for a new nipple.

I’ve been a X-ray certified pipe welder for 35 years it’s a easy fix to either plug weld it or weld a plug in it and redrill and tap

 

[tom in nc]

I wouldn't bet my life on JB Weld!

 

[SDSmlf]

i dont believe anyone make a replacement plug for the seneca barrel with FACTORY threadst the 5/8 x 18 is for making a custom barrel

So 5/8-18 is the incorrect thread for a Seneca factory breech plug, what is the correct thread?

 

[WALT53]

Yeah , it can be fixed . Dont just chase the threads , it won't be safe . Drill and Tap for a larger nipple/ cone as suggested already or drill larger , tap for a plug .... Then drill and tap that over sized plug for the original sized nipple/ cone . Best of luck ...

What he said or you can try the log cabin they larger threaded nipples to fix your exact problem track of the wolf may have them to .

 

[Rawhide67]

I'm a chronic putterer. I would fix the hole with the appropriate size milling bit, thread it, sleeve it, then drill/tap 1/4x28 and put another nipple in.

I know 1/4x28 isn't right for a Seneca but those dinky little nipples in the Seneca and Cherokee kind of annoyed me .

 

[2 shots]

So 5/8-18 is the incorrect thread for a Seneca factory breech plug, what is the correct thread?

not sure off hand will have to measure mine. there seems to be 2 different sizes. i have a roached out .45 barrel, i purchased a .36 barrel w/o a plug. i pulled the plug out of the .45 and it does not fit the .36 . i dont know if the used different plugs in the .45 and .36 or they just changed somewhere along the line. they are both factory barrels. seems odd that they would use different sizes for the two calibers so thinking it was a production change.

 

[Bucks Co]

I'd drill and tap the breech to a 5/16 thread; then make a bushing threaded 1/4 x 28 - I've done it and it works - if you think that 5/16 doesn't make a thick enough bush then go to 3/8".

 

[sturmkatze]

Had my uncle pickup what I think is a .45 senaca . Seller broke the nipple off and then used a hand drill to try and get the base out. I really wanted it for the stock but would be nice if I could fix the nipple hole . Will be a month or so before I can get it picked up . What do you guys think? Thanks. FBC

Black. Powder. Gun. Smith. Dey be dooz dat fo’ a living’.

 

[flntlokr]

looks the same as mine.

Mine too.