Repro screw pitch

[Richard Flanders]

Just got this plea from Charlie of Hill Rod and Gun in Bozeman. Anyone know that answer?

Hey Rich -

Need your help - I am replacing the set screws on a Parker Repro 20 bore. The set screw is for the hinge pin/screw for the hammer. I have the replacement kit from Galazan but the screws are not appropriate so I am making them - what is the thread pitch?

Cheers,

Charlie

[Chuck Heald]

The solution I always used when in this predicament if the old screw wasn't available, I would use some silicone dental impression material to make a plug of the inside thread and use an optical comparator to measure pitch and diameters.

[Richard Flanders]

I pulled a screw from my Repro 28 and put a thread gage to it. 44tps seemed the closest and a very good match.