This dryer is turning into a lemon fast -- had to replace PC Board three months ago, now having trouble with cycle knob.

I just used the dryer w/no problems, then went back to use again. To my surprise, the Easy Care cycle knob just spun around, no clicks between cycles on dial. Dryer would not start.

Husband pulled knob off 'stem,' discovered the plastic on underside of knob was cracked. His solution was to switch that knob with one I use infrequently (wrinkle care on/off). That second knob cracked on first try to select a cycle. Husband pulled it off, and now uses a pair of pliers to force 'stem' that knob should turn to select a drying cycle.

What part do I need now to fix this thing?