Singer Merritt 4022 free arm repair/ replacement parts. Thread guard assembly #173917. Includes: Thread guide mounting screw (upper), thread guide assembly (upper), thread guard bracket, two tension disks #'s 176828 & 9, tension release lever, two tension springs (small & large),tension control knob assembly, control knob ring, control knob with stopper washer and nut. Plus tension stud screw, spring washer, thread take-up spring case (front & back), thread take-up spring and cover,lower thread guide w/screw and three mounting screws for unit. Price includes shipping to lower 48. Return for refund if fails on your Singer 4012 or 4022 restoration.