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 5855-00-014-5008
NSN 6220-01-458-6211
NSN 5855-00-688-9954
NSN 6685-00-470-8651
NSN 5996-00-388-6552
NSN 6145-00-545-7215
NSN 5996-01-290-0988
NSN 6610-00-100-1195
NSN 6610-01-409-1781
NSN 6620-01-651-5425
NSN 5945-01-446-7074
NSN 5945-01-517-0534