I have a Tormek Supergrind 2000 that is about 24 years old and still going strong. The rubber on the drive wheel will get hard and slick over time, but a tip from Jeff Farris who was the original US distributor is to use belt dressing periodically on the rubber. My machine is on its second or third drive wheel. If it has been a few years since you last replaced the shaft bushings then it is probably time to change those out as well. Lastly, if the drive shaft is still the Supergrind 2000 style it is very likely corroded and should be upgraded to the T-7 style.