Flange 37 must be fixed sufficiently forwardly on forward section 28 to prevent {HEAD ~ interference} with {TAIL ~ slidable movement} of rearward section 26 during longitudinal repositioning thereof 
with
Flange 37 must be fixed sufficiently forwardly on forward section 28 to prevent { HEAD ~ interference } with { TAIL ~ slidable movement } of rearward section 26 during longitudinal repositioning thereof
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