I'm building fly rod for my grandson's birthday this month. Finished the cork grip and had to make a couple of things for drying the epoxy that covers the thread wrappings. Came up with this idea. The motor is a microwave turntable motor. The part with the rubber bands was drilled and turned to had a friction fit over the shaft. The end of the grip with fit there . The other part goes into the rubber bands for the tip section. Most tips are about 1/4 inch or bigger. A few wraps of Teflon tape will give a good friction fit. Motor will run continuously for 10-12 hours, generating a bit of heat. Have had these before and they create no problem. The mounting keeps heat to minimum.