I've built a wet tumbler, but am having issues with keeping the drum rotating. My drum is made from a piece of plastic pipe that is 20" long and is 10.5" in diameter. My motor is from an old treadmill and is turning the rollers I scavenged from the treadmill. I tried non-slip tape (skateboard tape), but the drum causes the grit to wear away and the drum stops rotating after 15-20 minutes. Does anyone have a better way to skin this cat?
Thanks in advance.