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Look on the box, instructions, or other packaging to find contact information for Rival. The Rival manufacturer or company can likely provide you with a new knob, or point you in the right direction as to where you can find the right one.
Salvage yard or dealer.
Replacement lid for my rival roaster
Dealer Salvage Yard
GM dealer can get them or check your local junkyard.
Turn knob To ON...............................
There are a number of places one can buy kitchen cabinet knob replacement parts from. One can purchase such items from Home Depot, Walmart and Knob Depot.
To remove the knob there is quick release on the back edge of the knob, simply push the lever and the knob will pull off. To install a replacement knob simple push it onto the shaft until it clicks into place.
I would start by checking the web under "Air Gun Repair" or see the link below.
To get replacement parts for a Ronco Showtime Rotisserie, you should contact the manufacturer directly via phone or E-Mail. The needed contact information is printed on the device itself.
You might want to consider just replacing the stereo. If you have a special attachment to the stock unit, maybe you can find a used unit somewhere. You'll probably have a hard time getting just the knob somewhere.
You should find the 'adjustment knob'.