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 5920-00-081-9156
NSN 5950-00-057-3813
NSN 6650-01-547-8631
NSN 2925-01-345-9439
NSN 5915-01-431-9235
NSN 5996-01-217-7980
NSN 6135-01-171-9299
NSN 6620-01-586-4260
NSN 5910-01-230-4829
NSN 5965-00-285-0745
NSN 5965-00-289-6280
NSN 5895-00-682-9339