Robert Y Jasper , GA December 14, 2021 Appliance: Maytag 34" Gas Built-In Downdraft Cooktop CVGX2423B18 Maytag Cooktop Cvgx2423b18: The knobs were worn. How to replace Burner Knob. It was easy. Just pull off the old knobs and push on the new ones. It made a big difference in the looks of my old cooktop. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes