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