[T2] Help-alternator bolt stripped

[Mike Benthin]

Daughter borrowed 78 camper to take friends swimming, noted the red 
light came on after she had trouble shifting to 3rd and overrevved 
it....  She checked and noted belt had hopped off (was loose?) and she 
and friend got it back Upside Down!  Horrible shrieking!  I got to her 
with tools and could not loosen the adjustor bolt, stripped hole for the 
6mm allen wrench.  Noted that the bolt was tight but you could move the 
alternator around- bad bracket or loose holding fixed bolt? We got the 
belt off and turned it over, using 7/8" wrench to turn alternator as 
belt was worked over its pulley.  Started OK, drove home in dark with 
voltage over 13. Now, do I use a vise grip, cut a slot for screwdriver 
with dremyl, weld an allen into the hole, cut off bolt head and hope it 
will back out with fine plier, or jam a filed 7mm allen into the hole? 
Anyone change this @&*^#$ bolt for a cap bolt a socket will work on?

MUTS Oboe/EH support = Michael's Ultimate Thumb Saver
93 Chevy Roadtrek 210P
78 VW Westfalia Camper