{HEAD ~ A device} 1 wherein {TAIL ~ said members} are dimensioned to compliment the dimension of said spaces in such close tolerance to said elongate bars that said members clear material blocking said spaces when said carriage assembly is actuated without wearing said elongate bars 
wherein
{ HEAD ~ A device } 1 wherein { TAIL ~ said members } are dimensioned to compliment the dimension of said spaces in such close tolerance to said elongate bars that said members clear material blocking said spaces when said carriage assembly is actuated without wearing said elongate bars
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH