| So how did I do that?
I started with several trips to the hardware store. Home Depot had a
good selection I thought, but that is before I discovered that Ace
Hardware has a much larger selection. The allen cap head bolts are
made with head ridges and are unpolished. First the ridges have to be
ground out, without putting deep score marks in the head. I performed
all my bolt operations by chucking the new bolts up in my drill press.
I suppose you could use a hand drill, and maybe clamping the hand
drill into a vise, but it would be difficult. Quite a bit of pressure
is applied to the head during polishing, and the bolt has to stay in
place.
Assuming a drill press is used, chuck up the new bolt. Start with a
grind stone, whet stone, or course grit sandpaper to grind out the
ridges.
Next apply a grit of about 100 to further smooth the head.

Last grit should be 330, things should look shiney at this point.
Finish with a metal polish in a cloth (or Stainless Steel buffing
cake). I've tried both because I have both, and the results are the
same.
That's it. Stainless Steel fasteners that hold up to the
environment much better than anything with a chromey price tag.
"Chops" polished SS on the left...........................chrome on
the right. 
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