I picked up an old frame repair book by Bear Equipment, a while ago. In describing the installation of rivets, it said to put the rivet in place, heat the shank and then form it. I always thought that they were dropped in already glowing.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!