Hinge Pin Screw Head Indexing

[Autumn Daze]

Thanks Glenn...You pretty much nailed it. I was just too lazy to type all that....

As for you Frey...Its spelled POLLOCK

[Austin W Hogan]

Dave Is correct it is a 1/4 x 32; see the photo. If you enlarge the lower side of the screw head, you will see it is chamferred for about 1/32 inch at what appears to be the V of the thread. This particular screw head does not bottom on its flat but on its edge. This is the only hinge pin I have that removes easily so I cannot comment about this being the same in all guns.
An important observation on this gun is that the frame and roll are continuously threaded.

Best, Austin