Each head holder 22 has {HEAD ~ a downwardly open recess} 29, FIG 2, in {TAIL ~ direct communication} with the suction holes 30 in the mounting pins 28 
Each head holder 22 has { HEAD ~ a downwardly open recess } 29 , FIG 2 , in { TAIL ~ direct communication } with the suction holes 30 in the mounting pins 28
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH