Mounting an original Polyglas

I had a vintage set of M&H slicks that I wanted on some rims for a photo shoot and maybe a burnout or 2. They were 60's old but were not rotted from what I could see. The guy told me no guarantees and as soon as he put it on the tire machine to mount it, the bead ripped in a cloud of dust. He got the other one on and I took the shot anyway from one side but we were standing back when he aired it up to seat the bead. you can mount these pretty easily on a standard rim with some tire irons, just make sure you got the bead in the deepest part of the rim when you work it around the other side. It should almost mount with your hands. Good luck and stay safe airing it up.