Product review (5 stars): New life for my old dryer
I wasn't sure this would solve my problem but I thought it was worth a try.  Easily saved having to buy a new dryer.  Did some troubleshooting - dryer was loud, drum did not look centered and I could move it up and down - and decided it was probably the rollers.

Instructions that came with it were okay, but video online was helpful.  One of the rollers was very worn and was tipping on the shaft.  Had a little difficulty getting the triangular retainer rings snapped on.

Arrived quickly, exactly what I needed.  My dryer is so quiet now.  I probably really only needed to replace the rollers, but why not replace the belt and pulley to while it's apart?