Lincoln Service Parts 2 › Lincoln Electric 9SS18393-1 POLARITY SWITCH ROTOR & SHAFT ASBLY S18393-1 Lincoln Electric 9SS18393-1 POLARITY SWITCH ROTOR & SHAFT ASBLY S18393-1 Sale Price: $48.79 Original Price: $56.11 POLARITY SWITCH ROTOR & SHAFT ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! POLARITY SWITCH ROTOR & SHAFT ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1