Robert M Stuart , FL June 06, 2017 Appliance: Model GE DRYER Knobs cracked won't turn switch Replacement knobs come with an upgrade, they have a metal ring around them to keep them from cracking. I did the same thing with the timer knob, planned to do the same with the new knobs- but no need, all set. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes