After setting of {HEAD ~ the resin} {TAIL ~ the bolt} is rotated in a second sense so that the bolt penetrates into the anchor to tension the bolt 
After setting of { HEAD ~ the resin } { TAIL ~ the bolt } is rotated in a second sense so that the bolt penetrates into the anchor to tension the bolt
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH