I tried different wrenches/sockets etc. I found this worked best. The idea is to be sure the screw and nut are hand-tight all the way into the riv-nut before you start. With this method I was able to simultaneously hold the works tight against the wall while holding the cap screw stationary with one wrench as you move the other to tighten the nut down which causes the riv-nut to collapse & expand in the hole.
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