David R Mahwah , NJ December 08, 2015 Appliance: Model GE GAS COOKTOP JGP336 Cosmetics only worn knobs on 20 year old cooktop no original instructions for non abrasive cleaning Pulled-up and off the old knobs . . . and pushed down and on the new ones! So easy, even a caveman could do it. (Think that might ever catch on? Naaaah, I agree.) Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes