The acorn nut doesn't really function as a nut in this application, but more as a decorative way to hide the ugly end of the rivet and to provide some load-spreading. Someone has to hold the acorn nut still from inside with a pair of pliers while the rivet is installed from outside.
Joy and Buddy on Yahoo Scampers have made nut holders out of PVC pipes, hose clamp and alum end to hold nut against wall during installation so it's a one-person job.
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