{HEAD ~ a follower} secured to {TAIL ~ each} of said racks and extending from said central opening to one of said peripheral openings to be received within a respective groove of said sleeve upon rotation of said shaft, 
secured to
{ HEAD ~ a follower } secured to { TAIL ~ each } of said racks and extending from said central opening to one of said peripheral openings to be received within a respective groove of said sleeve upon rotation of said shaft ,
HEAD HEAD HEAD HEAD HEAD HEAD REL REL 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 OTH OTH