USCamera import Kodak focus shaft gear for all many Carousel projectors including the 550, 600, 650, 700, 750, 800, 850, Ektagraphic Series and more. Generally you will replace this gear because the old one spins freely and has split on the focus shaft. This is the gear on the focus shaft that engages the projection lens. It must be carefully pressed onto the focus shaft. Package of 1 gear. Made by USCamera China.