I linked to the picture:
DSC05928.JPG
 
I cut a simple wedge out of 1/2 x 1/2 aluminum bar stock and drilled a hole in it. Super simple and worked like a charm. Only trouble is that they're easy to lose if you don't watch em when the rivet pops so make a few at a time...
 
I cut a simple wedge out of 1/2 x 1/2 aluminum bar stock and drilled a hole in it. Super simple and worked like a charm. Only trouble is that they're easy to lose if you don't watch em when the rivet pops so make a few at a time...

+1 - hand made are smaller too and leave more head room for the tool. I love tools, but the hand made served me better, not just cheaper.