[Marco Tahtaras]

Originally Posted by rotorwrench

I think the reason a lot of the frame holes are so large after rivet removal is that the original expansion pushed the hole that way. Originaly the hole was only around .003" larger than the rivet shank diameter.

The holes were actually quite large. Where 1/4" rivets were used the holes were just under 5/16". This allowed a looser tolerance for the hole locations since most if not all the holes were punched into the stock prior to final forming of the shape. The rivets still fill the hole entirely including any off-set.