Here is a little more information. So the pin is coming out of the shaft ( not the butt ) Also I tried to screw it into a 3/8 x 10 big pin and the pin was to fat and did not fit. Also it's a fatter butt, not as fat as the old Brunswick's but fat. It's definitely old as hell tho I can smell it when I open the case and it just smells like it's from the 30s or 40s lol...So ya it's definitely not a 3/8 x 10 so we can rule that out .. I guess I'll just have to go by home Depot and see what screw fits unless it's one of those Canadian metric pins that member was talking about