Thread size on a Lyman

[BEAVERMAN]

OK you GPR gurus, whats the thread size and pitch on the blow out screw on the drum of a Lyman GPR?

[2 Locks]

I don't know the threads & pitch, but it takes a 0.5mm Allen wrench

The sixth item down the list is the exact part, direct from Lyman
http://www.lymanproducts.com/store/page155.html
a bit pricey for just a set screw, but it won't break the bank, and you will have the right part.

[BEAVERMAN]

I don't know the threads & pitch, but it takes a 0.5mm Allen wrench

The sixth item down the list is the exact part, direct from Lyman
http://www.lymanproducts.com/store/page155.html
a bit pricey for just a set screw, but it won't break the bank, and you will have the right part.

Thanks Dave, still need the thread size so I can buy a tap and chase the hole before installing a new one

[2 Locks]

That makes more sense.
You might want to go strait to horses mouth:
http://www.lymanproducts.com/lyman/contact/

[prairie dog]

I would be interested to know the answer if anyone finds out.

[Florida Jim]

I'm new  here. But I'll see if I can help.
The screw size on the drum is metric "M4x.7"
This is on my 1997 vintage LH GPR.
I hope this helps.

Jim