After years of spinning, the connector joining the footman (upright piece connecting the treadle to the wheel) to the wheel can break. This replacement part includes the screw that secures the connector to the footman and then it snaps into place on the wheel. It fits the S10, S15, S17, S20, S50, S60, S70, S71, S75, S76, S77, Olivia, and Victoria.