The suction heads 21a, 21b and 21c have {HEAD ~ their increased diameter base portions} 31 closely engaged in the recesses 29 in {TAIL ~ the head holders} 22 
The suction heads 21a , 21b and 21c have { HEAD ~ their increased diameter base portions } 31 closely engaged in the recesses 29 in { TAIL ~ the head holders } 22
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH