Tempering Drill Bits

I would use a masonry bit for the larger sizes. You can hone them and thay cut through hard steel fine.
 
I thought about heat but on most jobs I can't damage the surrounding painted surface and also cannot burn though the tapered hole in the plate for the bolt head since a new bolt will be installed. I'm going to experiment with spot annealing pressing a red hot rod against the bolt head. How big of a mess does the welding rod make?[/QUOTE]

you could use 3/32 6011 and not make too big of a mess .
just protect any surface exposed to the arc welding that matter and give it a shot
the box stores sell the electrodes, just run em' a little hotter than welding
try it out on a scrap piece first so you get the idea
 
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