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 2925-00-915-1827
NSN 6130-00-381-1927
NSN 6650-01-085-6088
NSN 5960-01-432-6038
NSN 5895-01-561-5532
NSN 5905-01-619-8232
NSN 6110-01-486-3904
NSN 5975-00-134-8529
NSN 5960-00-594-0824
NSN 5905-01-461-2156
NSN 6685-01-491-3879
NSN 6685-01-027-0721