Description Our Singer Class 29 / Model 29-4, upper thread tension adjusting assembly includes the following parts: #668 – slotted, threaded post (1) #8617 – cup (1) #8618 – discs (2) #8619 – spring (1) 1560 – thumb nut (1) Number in parenthesis is quantity of each part. Part numbers are from original Singer Manufacturing Company parts lists. Included parts
