Lincoln Service Parts 1 › Lincoln Electric 9SM20978 SWITCH PLATE ASBLY M20978 Lincoln Electric 9SM20978 SWITCH PLATE ASBLY M20978 Sale Price: $554.51 Original Price: $637.69 SWITCH PLATE ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! SWITCH PLATE ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1