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 5920-00-153-6941
NSN 6110-01-389-3841
NSN 5945-01-151-7457
NSN 5990-00-845-2864
NSN 5925-01-013-8329
NSN 5935-01-418-8604
NSN 5999-01-191-5701
NSN 6610-01-080-1041
NSN 2925-01-243-0328
NSN 6650-01-014-5990
NSN 5999-00-443-5829
NSN 5855-00-482-9876