By turning this screw when {HEAD ~ the device} has been mounted on {TAIL ~ bone pieces osteogenesis} can be achieved 
mounted on
By turning this screw when { HEAD ~ the device } has been mounted on { TAIL ~ bone pieces osteogenesis } can be achieved
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH