Lincoln Service Parts 2 › Lincoln Electric 9SS29420-17 KNOB (RATE SWITCH) S29420-17 Lincoln Electric 9SS29420-17 KNOB (RATE SWITCH) S29420-17 Sale Price: $8.97 Original Price: $10.31 KNOB (RATE SWITCH) PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! KNOB (RATE SWITCH) PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1