Dryer made a terrible squealing noise

Took a bit to first figure out how to get the front of the dryer off in order to access the motor, wheels, and belt, but found a "how-to" online. Once I had that, the rest was easy.

Lubricated motor and guide wheels but squealing still there. Then noticed the "idler pulley assembly" (the part that keeps the belt tight against the drum) looked a bit old and worn. Ordered a replacement part on this site because it was much much cheaper than a service call, installed it.... and NO SQUEAL!!!