Aircraft Tool Supply for the rivet setting tool, about $28 for a set or four or five, or make one out of an old broken off or otherwise ruined chisel, both ends will be flat -- Dremel a concave surface on one flat end. Put masking tape over the rivet head to help avoid "smiley faces" around the rivet head on your sideplate. Tanker's bucking bar set, (do a seach) or a heavy, large diameter bolt, (maybe 3/4" to 1" -- trailer hitch bolt works OK) grade 5 or grade 8 is good too, cut off to fit inside the receiver side plates to buck up tight to the head of the rivets. Move for each rivet, check tightness frequently during peining. Use two nuts, one as a locknut, and grind any letters/numbers off the bolt head.
Tanker sells the bucking wedges and rivet set tool that fits a standard muffler hammer or you can use a regular hammer. For doing multiple receivers it's pretty fast...check out the build tutorial on the home page for pics of the wedges and rivet set tool. Tanker will also redress the riveting tool free of charge when you wear it out. Look in the members list to send him an email.
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