Bonnie P Rock Hill , SC March 31, 2019 Appliance: Frigidaire Dryer GLER331AS2 Frigidaire Dryer Gler331as2: The on/off knob and the timer knob were broken on my dryer. How to replace Selector Knob. I simply placed the new knobs on in less than a minute. Thank you to the person who assisted me on the live chat to get the correct knobs. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes