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 5985-01-266-1721
NSN 5930-01-089-7671
NSN 6610-01-627-0642
NSN 5915-01-658-2788
NSN 5925-00-206-1754
NSN 6610-01-209-8991
NSN 5915-00-179-4623
NSN 6220-01-649-1515
NSN 2925-01-311-5769
NSN 6220-01-100-5093
NSN 5915-01-312-2403
NSN 5996-00-548-8762