Clamps 22 are mounted in slots 14 by {HEAD ~ screws} 23 having {TAIL ~ heads} 24 
Clamps 22 are mounted in slots 14 by { HEAD ~ screws } 23 having { TAIL ~ heads } 24
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH