I bought a set for my early 50's style '27T(on the left) which has bias ply's on it. I had the local Tire Barn mount the tires. They used soap as they usually do and it caused the port-a-walls to slip out from under the rim bead making them impossible to mount. So I left them off for now hoping that later I can use a bead breaker to open up the bead just enough to clean out the soap and try again. I've even considered using something like 3M weathestrip adhesive. I like the rubber hammer idea. I was to young during the early 50's to know what they were doing to install them.