Product review (5 stars): Dryer blower wheel
I am a DIY'er and purchased the blower wheel and a roller wheel when my dryer was making tons of noise upon starting and mostly all the way through the cycle.  Basically I replaced two parts and it was like a brand new quiet dryer.  The middle hole of the blower wheel will wallow out(to make a circle) over a long period of time which makes the wheel spin freely (it should not, and the hole on a brand new one will have a flat side to the "circle"...like cutting a slice off the top of a tomato.) The wheel is now in a "fixed" position and only took me about 20 min to repair. The roller wheel was for added precaution as I wanted to check everything else since I was taking it apart. BTW, this was very inexpensive and I received it very fast.  Don't buy it at the stores unless you need to repair it that day.