Yesterday I did a trial run with two buddies towards eventually hot riveting my frame cross members back together. We had some success but ultimately stopped because we weren't sure that the rivets from KW have long enough shank material to correctly "mushroomed" out enough with the air chisel rivet setter I bought from McMaster. We first heated the rivets up in a Forgemaster propane powered two-burner forge until they were poker hot (this pic shows us unloading them when we stopped, I don't have a pic of them hot unfortunately) The KW rivets are 0.663" across the head, 0.75" from the bottom of the head to the end of the shank, and 0.372" diameter shank. The rivet setter I have came from McMaster is for 3/8" domed head rivets: (McMaster-Carr). Here is the top domed surface that was backed up with a bucking bar (McMaster-Carr) Bottom surface (end of shank) that was hit with the air hammer/domed rivet setting die. This rivet was put into the front cross member bottom frame horn. You can see where the die skated slightly off the domed head as it wasn't quite held perpendicular to the frame and it indented the cross member. After some consideration, we think that we might get better results next attempt if A) we use slightly longer rivets, B) fabricate a new backing bar with a cup milled into it to match the rivet dome, and C) position the new backing cup in place with a port-a-power against the floor or other side of the frame. Does anyone have experience doing this that could advise or chime in? It seems like information on hot riveting isn't that plentiful and it's hard around where I live to find folks that are have knowledge. I'd love to hear what folks think that have tried this before.