Lincoln Service Parts 2 › Lincoln Electric 9SS18697-55 CONTROL KNOB & SET SCREW S18697-55 Lincoln Electric 9SS18697-55 CONTROL KNOB & SET SCREW S18697-55 Sale Price: $35.57 Original Price: $40.91 CONTROL KNOB & SET SCREW PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! CONTROL KNOB & SET SCREW PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1