Adrianus H Cumming , GA January 26, 2020 Appliance: Whirlpool MODEL_PBK0190 Whirlpool Model_Pbk0190: Broken control knob on 18 year old dryer. How to replace Selector Knob. Found a new replacement knob on AppliancePartsPros, ordered it, and installed it within a minute. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes