{HEAD ~ Such positioning} can be accomplished by providing {TAIL ~ a plurality} of 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 
accomplished by providing
{ HEAD ~ Such positioning } can be accomplished by providing { TAIL ~ a plurality } of 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 REL REL REL 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 OTH OTH OTH OTH OTH