Loud noise (rumble) particularly at start up

Disassembled via Video. Problem was the blower wheel "flat" which engages on motor shaft was worn away allowing blower wheel to spin on shaft. Installation of new wheel resolved problem. Replaced drum rollers but the orginals were probably OK. The flat was worn away over time due to startup torque (weak point in orginal design). A possible fix would be to drill and tap a hole in blower wheel to allow a set screw to engage with flat on motor shaft. A weak point in video is showing reinstallation of belt. There is a removable panel on back of dryer that allows access to motor / pully that needs to be used. Video did not mention.