▁or ▁revers es ▁the ▁tool ▁back ▁into ▁the ▁first ▁bore ▁pit ▁to ▁retrieve ▁it . ▁ ▁Now ▁between ▁the ▁two ▁p its ▁is ▁a ▁completed ▁bore ▁under ▁the ▁obst acle ▁which ▁can ▁be ▁used ▁to ▁run ▁the ▁product . ▁ ▁Draw back s ▁P neum atic ▁bore ▁tools ▁do ▁have ▁draw back s ▁which ▁can ▁cause ▁difficulties ▁comple ting ▁the ▁bore . ▁ ▁First ▁the ▁distance ▁of ▁the ▁bore ▁the ▁tool ▁can ▁create ▁is ▁limited ▁by ▁the ▁length ▁of ▁the ▁h ose ▁that ▁supplies ▁the ▁tool ▁with ▁air . ▁ ▁Also ▁the ▁tool ▁is ▁not ▁ste er able . ▁Once ▁it ▁has ▁ex ited ▁the ▁bore ▁pit , ▁the ▁operator ▁no ▁longer ▁has ▁control ▁over ▁it . ▁ ▁The ▁tool ▁can ▁be ▁def lect ed ▁by ▁rocks ▁and ▁soil ▁density ▁to ▁a ▁path ▁the ▁operator ▁had ▁not ▁intended . ▁ ▁If ▁this ▁def lection ▁is ▁in ▁the ▁direction ▁of ▁the ▁surface , ▁the ▁tool ▁can ▁cause ▁damage ▁to ▁the ▁obst acle ▁being ▁b ored ▁under . ▁If ▁it ▁is ▁down ward , ▁the ▁tool ▁can ▁d ive ▁to ▁an ▁un rec over able ▁depth . ▁ ▁If ▁it ▁is ▁def lect ed ▁side ▁to ▁side ▁the ▁tool ▁could ▁also ▁run ▁into ▁other ▁util ities . ▁ ▁These ▁ha z ards ▁make ▁it ▁important ▁for ▁the ▁operator ▁to ▁maintain ▁close ▁observation ▁of ▁the ▁tool . ▁The ▁type ▁of ▁ground ▁the ▁tool ▁is ▁working ▁in ▁can ▁also ▁lead ▁to ▁problems . ▁If ▁the ▁soil ▁is ▁too ▁loose , ▁the ▁tool ▁cannot ▁compact ▁the ▁soil ,