A round or oval part and either a d-shaped or a heart-shaped part mounted on a common axis so as to permit relative rotation between the parts.
NSN 5950-00-594-3695
NSN 5945-01-573-6163
NSN 5920-00-338-6966
NSN 5930-01-092-1192
NSN 6110-01-256-4959
NSN 5945-01-052-6222
NSN 7035-00-794-0792
NSN 5999-00-584-4577
NSN 5855-00-763-2155
NSN 6130-01-398-3313
NSN 6110-00-934-7943
NSN 5855-01-461-8089