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 5855-01-089-2248
NSN 6620-01-081-1042
NSN 6130-01-527-5882
NSN 5930-01-188-3331
NSN 6220-00-232-4436
NSN 6610-00-256-8006
NSN 6220-00-660-5539
NSN 6105-00-216-8067
NSN 5960-00-990-1508
NSN 6130-00-516-9343
NSN 5895-01-652-5851
NSN 5905-00-647-1016