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 2925-00-724-9252
NSN 4140-00-269-8545
NSN 5930-01-012-1939
NSN 6240-01-534-5829
NSN 5965-00-458-7321
NSN 6130-01-451-2186
NSN 5960-01-589-6846
NSN 5910-01-305-2914
NSN 6240-01-608-4401
NSN 5910-00-240-2327
NSN 6645-01-483-5519
NSN 5975-00-274-3772