a plurality of {HEAD ~ worm gears} each having a helical thread and being rotatably received within said peripheral openings of {TAIL ~ said sleeve}, one of said followers being received within the helical thread of one of said worm gears, 
a plurality of { HEAD ~ worm gears } each having a helical thread and being rotatably received within said peripheral openings of { TAIL ~ said sleeve } , one of said followers being received within the helical thread of one of said worm gears ,
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH