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 5996-00-403-6791
NSN 6645-01-328-1034
NSN 6220-00-983-6920
NSN 6650-01-391-7527
NSN 6620-01-368-2723
NSN 5985-00-563-7685
NSN 5999-00-651-3835
NSN 5998-01-250-6257
NSN 6650-00-925-1274
NSN 6110-01-317-2372
NSN 5855-00-912-3885
NSN 5985-01-063-5903