Brenda I Mc Alester , OK October 27, 2018 Appliance: Samsung Gas Range NX58F5500SS/AA-0000 Samsung Range Nx58f5500ss/Aa-0000 / : Control knob would not turn on. How to replace Range Cooktop Valve Assembly. I removed the deflected knob and replace it. This is one of the easiest repairs I've had. Now it is like new. The customer service was so helpful. Part was delivered within a day. I appreciate the way AppliancePartsPros.com handled my request. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes