Bill --
I have a "basket" that I use for small parts like that...
And I use a pair of slip pliers for holding other parts that are too small to hold with gloves etc.
Maybe take one of your coffee cans and punch a bunch of holes in it and use it like a "strainer" basket... and blast away - give it a shake to move the bolts and nuts - and blast some more. Experiment with pressure -- because you can blow the stuff right out of the "basket". They also sell these small parts baskets at TP Tools... just google 'em. They have lots of stuff for blasting..
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