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 6645-01-242-4826
NSN 2925-01-014-8007
NSN 5835-00-450-3531
NSN 6685-01-147-5617
NSN 5930-01-372-4092
NSN 5915-01-237-0683
NSN 6130-01-447-3164
NSN 6110-01-373-8476
NSN 5835-01-384-3206
NSN 5945-01-206-3962
NSN 5935-01-133-7142
NSN 4140-01-440-5757