I've been using a pneumatic pop riveter and a die set from Aircraft Spruce to countersink the rivet holes in the ribs and spars, and it's been working well. But when I reached the area on the top side of the main spar where the S-mod angles are close behind, it wasn't possible to use this method. My solution was to buy a cheap imported channel lock-type knock off from ACE for ten bucks, regrind the jaws on my bench grinder, and drill a counter sink on one face. I had to tape a shim on one side to improve the geometry, but it works. If someone has a better solution they'd like to share I'd like to hear it before I move on to the left wing.
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