Lincoln Service Parts 2 › Lincoln Electric 9SS31230 ROTARY SWITCH KNOB S31230 Lincoln Electric 9SS31230 ROTARY SWITCH KNOB S31230 Sale Price: $3.50 Original Price: $4.03 ROTARY SWITCH KNOB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! ROTARY SWITCH KNOB PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1