On our Maytag dryer, the drum rests on rollers in the back and 2 smooth glides on the front. The glides had worn down completely causing the metal drum to rub against the metal rim of the dryer as it turned. We discovered the problem because metal shavings were causing dark orbital shaped marks on

Took the front and the lint catcher off the dryer to expose the front of the drum and the glides. On our dryer the drum rests on a roller in back and smooth glides in front which are held in place by rivets. these glides had worn down to the metal so that the drum was grinding against the metal ridge as it turned. Drilled out the existing rivets using a 1/8" drill bit. Took out remains of old glides and inserted new. Rivets came with the kit and it was easy to assemble. Put it all back together and now the dryer works beautifully!!