[IKE]

I have used the warm lightly soapy water technique for sliding grippy hose material onto an aluminum tube roller.

I have also used this technique to install AndyMark collector stars which have a 0.5" square hole onto a 0.75" square shaft. The warm lightly soapy water causes the rubber to expand a little bit, and slide freely on the metal. Once dry, the pieces grip very tightly and do not more.

For mini-bot rollers, I know on a couple of them we used the regulated air and nozzle technique to install surgical subbing on shafts.