Product review (5 stars): Cheaper Than A New Dryer!
Spent an afternoon doing preventative maintenance in our dryer after one of the idler wheels started getting noisy.  Couldn't have been simpler - clear instructions and all the parts you need; running very well after several months.  One bit of advice is to double check that you've reassembled the unit in the correct order - there are a couple of ways this might get confused or a screw left out.