On Fri, 26 Jun 2009 06:25:30 -0400, Wayne.B
wrote:

y engines are set up for a 2 inch Delco foot except
that they have a 1/2 inch mounting bolt instead of 3/8ths. Drilling
out the alternator foot to 1/2 inch is easy and there is plenty of
metal left over.

That's interesting. I wonder why 3/8 isn't enough. I had a 4250 pound
airplane with the wings each held on by a couple of 1/4-20 bolts.
Loaded in double shear. [Beech D-17S].

Casady