This is sort of "Bubba." But years ago, I needed one of these, and I had a set of cheap harbor freight punches sitting on my work bench. One of them was the perfect size and I cut it down and shaped it to the RSB. It worked great, but again sort of bubba too.

But I think a set similar to this is what I had sitting there and used.

http://www.harborfreight.com/hand-to...-set-3577.html