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