Shelia C Rowland , NC January 05, 2021 Appliance: General Electric Gas Dryer GTDX100GM0WW Ge Dryer Gtdx100gm0ww: Knob on my mother's dryer broke. How to replace Timer Knob. We took the old one-off, and replaced it with the new knob. It only took minutes, it was easy as pie! LOL!!! Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes