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 5999-01-078-6321
NSN 2925-00-738-9065
NSN 5895-00-208-1949
NSN 5998-01-487-0310
NSN 5990-00-434-0620
NSN 6620-01-544-4857
NSN 6135-00-444-1402
NSN 5930-01-395-2950
NSN 6240-01-316-8622
NSN 6240-01-100-4158
NSN 6135-00-497-0491
NSN 5925-01-176-3153