Product review (4 stars): I did the epoxy trick
I guess it's not really a trick, but DMengal gives a really great explanation on how to improve the quality of this knob (http://www.amazon.com/review/R3EPWNCMP25Z59/ref=cm_cr_dp_title?ie=UTF8&ASIN=B002ZNNNZO&nodeID=2619525011&store=appliances ). I haven't tried it without the epoxy to see how durable it is, but I think filling in the hollow inside with epoxy is going to make this knob last a long time. The four stars is because it fit my dryer switch, and it's working. I deducted one star because of the extra work needed to ensure that this knob is strong and durable. Adding the epoxy isn't very difficult, but It does stink while you're working with it. It takes a long time to dry too, but so far it seems to be doing the trick.