Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Found a interesting custom tool for these type of rivets on eBay, used for Tonka Trucks of all things.

TONKA NYLINT BUDDY L STRUCTO, RIVET TOOL FOR 1/8" SEMITUBULAR RIVETS Fixt Dies

I think it will just enough bite to get to the farthest rivet.  I sent a ton of photos to the seller (maker I believe) and thinks it will work but if not he will accept a return for a refund.  The tool is at the high end of what I want to pay for one but it's much cheaper than "real" rivet tools.

Also, hansonrivet.com is sending me a bunch of sample rivets to try.