I went online to AppliancePartsPros and looked up the part by having the make and model information and scanning the display of parts. I found alongside the parts listing a link to a video which showed in about two minutes how easy it was to change out this particular part. I ordered the timer and was not expecting it to be delivered second day, but it was. It took me about 15 minutes to change out the part and use a knob that failed to turn the old part, finding that the new part worked the way it should. So, rather than pay a repairman visit or buy a new dryer, I have a well functioning dryer for less than $100 and 15 minutes of my time.