A distraction screw is mounted through the cylinder and with {HEAD ~ one end} resting on {TAIL ~ the chamber} 
resting on
A distraction screw is mounted through the cylinder and with { HEAD ~ one end } resting on { TAIL ~ the chamber }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL