Drawing 30 shows that a recess in the lower end of the F-637B seat back braces, .040" deep and 9/16" long, should be cut so that the bottom hinge surface will be flush with the rest of the forward surface of the F637B. Just curious how others have done this, other than taking it to a machine shop or having your own milling machine. I'm thinking about simply using a belt sander with frequent checking to get it right, since whenever I have tried to use a grinding wheel on aluminum, it just clogs up the surface of the wheel.
Anybody found a better way?
Anybody found a better way?