At the same time, the tightening system affixes {HEAD ~ the clamping lock} inside {TAIL ~ the beam} 
At the same time , the tightening system affixes { HEAD ~ the clamping lock } inside { TAIL ~ the beam }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL