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Hoosier, If you look at one of my earlier posts, I show my set-up for machining that surface. The method that I use produces a very accurate "circle" in the receiver and it makes obtaining a good fit rather easy. Here is a picture showing how the surface is machined by pivoting the receiver by hand against a very sharp and smooth broach. It leaves a mirror finish surface concentric to the hinge pin within less than .001 TIR. ![]() It's a rather difficult surface to photograph clearly, but I'll try to get a good picture in the next day or so. |