A device 1 wherein said members are dimensioned to compliment {HEAD ~ the dimension} of {TAIL ~ 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 
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A device 1 wherein said members are dimensioned to compliment { HEAD ~ the dimension } of { TAIL ~ 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
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