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 6240-01-247-8074
NSN 5895-01-491-5738
NSN 5950-01-634-0677
NSN 5915-01-423-3093
NSN 5920-00-998-2231
NSN 6320-01-512-2031
NSN 6645-01-320-4138
NSN 5910-01-410-9788
NSN 6685-01-173-5618
NSN 5975-01-009-5749
NSN 5950-00-937-8170
NSN 5910-01-285-4358