a follower secured to each of {HEAD ~ 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 {TAIL ~ rotation} of said shaft, 
a follower secured to each of { HEAD ~ 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 { TAIL ~ rotation } of said shaft ,
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH