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 5998-00-139-6418
NSN 6650-01-170-5440
NSN 5996-01-463-3152
NSN 5965-01-514-0932
NSN 5996-01-255-3281
NSN 2925-01-079-6229
NSN 5920-01-056-7603
NSN 5975-01-447-4060
NSN 6105-00-491-1180
NSN 6645-01-476-8013
NSN 5975-00-155-4181
NSN 5945-01-310-3277