{HEAD ~ a pair} of {TAIL ~ sleeves} loosely fitted about said other shaft and movable away from said one shaft, and 
{ HEAD ~ a pair } of { TAIL ~ sleeves } loosely fitted about said other shaft and movable away from said one shaft , and
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH