This part fits below the surface burner knob and has a center hole just big enough for the knob's shaft.
Sold individually. This black knob accepts a double-flat shaft.
This screw is sold individually.
Size: 8-32 x 1/4 inch.
This dual surface burner infinite control switch is just under three inches long. Using 240 volts, this switch will operate at 15 amps.