stripped tensioner bolt hole

hi all

2001 Golf TDi [ALH]

trying to re-install serpentine belt tensioner after an alternator 
replacement

2 bolts are good (the 2 shorties), but the long one won't snug up

stripped threads in the aluminum carrier arm

(not sure how this happened - garage recently serviced serp belt - 
someone may have used an impact wrench? I'm always very gingerly around 
aluminum, ever since my son and I had to put steel inserts in the block 
of his '97 Z3 b/c the head bolts wouldn't torque)

thoughts? tap for larger bolt? other ideas?

aluminum sucks

thanks

Rolf in MA
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