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 6645-01-110-4491
NSN 6135-01-575-8362
NSN 6645-01-359-7875
NSN 5855-01-421-1440
NSN 5985-01-110-1792
NSN 5960-00-160-2183
NSN 5895-00-379-4699
NSN 6150-01-251-8363
NSN 5998-00-132-0228
NSN 5855-01-585-1675
NSN 6110-01-426-1445
NSN 6135-01-551-0562