toolmanmike said

When I worked at Pennys, we had 3 steel rings 13,14,and15" they were 6" tall and had soft closed cell foam on the inside. Lube them up, slide them over the rim and push them against the bead. They took up the void between the bead and the rim. A little air and they would seal right up. Haven't seen them since. That was back in 74.

Click to expand...