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 6135-01-301-8776
NSN 6145-01-061-1566
NSN 5965-00-757-3403
NSN 5930-00-360-1967
NSN 5910-01-624-0104
NSN 5905-00-753-0299
NSN 5920-01-131-9714
NSN 5910-00-938-1277
NSN 5905-00-863-8787
NSN 5905-01-205-1725
NSN 6685-01-223-7564
NSN 5985-00-677-8336