Eugene P Greencastle , PA March 12, 2018 Appliance: Whirlpool Electric Dryer WED4815EW1 Whirlpool Dryer Wed4815ew1: Timer on the dryer was not working properly. How to replace Dryer D-Shaped Knob Insert. Replaced the timer, after watching the online video. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes