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