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 5935-01-423-1677
NSN 6220-00-296-4101
NSN 6320-01-290-5271
NSN 5905-01-463-9314
NSN 5895-01-603-4919
NSN 6240-00-813-6328
NSN 6110-01-168-8355
NSN 7035-00-179-3924
NSN 5985-01-172-7344
NSN 5895-01-655-3227
NSN 5950-01-214-5487
NSN 5950-01-204-2039