David M Wilmington , NC December 09, 2014 Appliance: Roper Washer RAS8445JQ0 Roper Washer Ras8445jq0: One of the knobs broke while cooking one day i was distracted and turned the know the wrong way the inside part that holds the knob on cracked and fell off. How to replace Control Knob. I looked up the model number on the range, Googled it and found your site. I ordered two knobs just in case I had another mishap. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes