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 5998-00-090-7303
NSN 5975-01-041-5836
NSN 5965-01-389-7058
NSN 6130-00-170-4844
NSN 5920-00-066-6885
NSN 6150-00-695-9754
NSN 6685-00-125-4472
NSN 6130-01-322-6173
NSN 5945-01-370-9275
NSN 5999-00-890-7485
NSN 5996-01-437-8824
NSN 5835-01-051-7584