So I found one at Sears for $50, got the tool gal on the phone, but she was "waiting on a customer and would be right back." http://www.sears.com/unknown-professional-hand-riveter-nut-tool-kit/p-SPM 667145614
While on hold, I thought, "What the heck! I'll check good old Harbor Freight!" And there it was staring me in the face dangling $19.99, including 1/4-20 mandrel and several others, even a few rivets for each size. So I let out a yahooooo, grabbed a sody pop, leaped into the Studebaker, lighted up a stogy, checked the basketball scores on the radio, peeled out on 2 wheels and picked one up. Now I'm back installing rivets like they're going out of style, singing lumberjack songs with my best gal by my side. Once again... life is good... http://www.harborfreight.com/45-piece-threaded-insert-riveter-kit-1210.ht ml
Best thing about McMaster is EZ returns as long as they ain't wore out.