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 5990-01-423-8189
NSN 5925-00-231-8668
NSN 6150-01-331-5686
NSN 5975-01-251-8646
NSN 5915-00-553-3650
NSN 5835-01-282-9768
NSN 5945-00-512-3497
NSN 4140-01-037-1162
NSN 5910-00-412-4482
NSN 6685-01-534-2785
NSN 6240-00-370-5862
NSN 5910-01-282-6052