I've always thought that the hole in the back of the hinge
pocket was for assembly purposes. Probably used to locate
the pocket in the welding jig. I see no other need for it
in the "Advance Design" of things.
That's typically what unexplained or otherwise useless
holes or notches were used for.
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 10/14/2013 1:07 PM.