At 01:02 AM 5/3/2009, Robert Keezer wrote:
>If it was center drilled, I would drill out the old stud. The
>hole  was instead drilled to 7/16 is about a 16th of an inch lower
>that the original.
>Drilling to the proper 8 mm will probably open up the hole to
>outiside the case.

Here's a thought -- clear out the old mess and drill/tap oversize,
thread aluminum rod to fit, install with red (stud-and-bearing)
Loctite and cut off flush.  Then drill/tap to correct size and
location and install stud.

Or open it out and have a welder build it back up with weld metal?

Did you actually mean 7/16?  That's 11+ mm.  5/16 is almost exactly 8
mm (7.9375), though of course the thread is different.  If it really
is 7/16, how about fill it with 7/16 threaded aluminum rod Loctited
in as above, then clean out the remains of the old stud and proceed,
with a Heli-coil or similar if necessary.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"