{HEAD ~ Such positioning} can be accomplished by providing a plurality of {TAIL ~ unequally spaced key slots} or the like in the disc, by providing a single key or spline on the shaft for engaging one of the key slots 
{ HEAD ~ Such positioning } can be accomplished by providing a plurality of { TAIL ~ unequally spaced key slots } or the like in the disc , by providing a single key or spline on the shaft for engaging one of the key slots
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH