means for rotating {HEAD ~ said shaft} within {TAIL ~ said central opening}, and relative to said worm gears, whereby said followers will travel within their respective grooves upon rotation of said shaft to be guided by said grooves to return to their original position 
within
means for rotating { HEAD ~ said shaft } within { TAIL ~ said central opening } , and relative to said worm gears , whereby said followers will travel within their respective grooves upon rotation of said shaft to be guided by said grooves to return to their original position
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH