When I opened our 12-year-old dryer, the belt around the tumbler was frayed so ordered a new one on a Friday, had the part on Monday and followed the APP video and all was good - or so I thought.
But the clunking continued so it was clear that it was a roller. So ordered a new roller (FedEx delivered a day later than FedEx promised), followed the APP video and all is good now. Thanks APP!