I opened the package. I tool out the plastic bag containing the replacement knobs. (I ordered two). I lined up the knob that needed replacing and pushed it on. The replacement knobs are of a better quality than the original and shouldn't break like the old ones. After this repair I was exhausted and took a nap.
Removed the back - Saw the broken clips on the base of the dryer (the wires to the motor were pulling out because the motor was slipping).
Guessed that the parts were motor clips (no pix in the web site!)
Got the parts in post - they were identical except needed some rubber grips inside to hold tight (Used pieces of bike tire inner tube cut to fit for this.) Attached clips. Works fine!!
(Son is an engineer - he found the problem. Husband is a retired doctor - he couldn't!! but together they supplied the muscle) Sue (67 years old)