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 5990-00-404-2451
NSN 6110-00-237-4862
NSN 6220-00-015-8944
NSN 5915-01-521-2953
NSN 5975-00-518-4977
NSN 5920-00-116-9368
NSN 6685-01-352-1472
NSN 6240-01-525-6585
NSN 7035-01-204-7481
NSN 5965-00-117-4214
NSN 5985-01-520-8609
NSN 5835-01-114-3194