heavy duty supply hose 70 has a male threaded end 71 for attachment to elbow 50 and a quick connect coupling 72 on the other end for connection to a suitable source of pressurized fluid such as a water hose threaded connectors are the preferred means for connecting tool bit 60 bore stems 30 and tool drive means 40 as they provide a relatively strong fluid tight connection and enable assembly and disassembly of tool10 to be performed relatively quickly and easily shaft 41 sleeve 21 and bore stems 30 are made of a suitably strong material such as steel weight collars 22 and tool bit 60 are preferably made of steel when dry boring plug 55 is screwed into female threaded end 45 of shaft 41 a female threaded end 32 of a bore stem 30 is screwed onto male threaded end 44 of shaft 41 and tool bit 60 is screwed onto male threaded end 31 of bore stem 30 fig4 if boring a vertical hole fig3 tool 10 is vertically positioned with front frustoconical portion 61 on the ground at the spot where the hole is to be bored sliding weight 20 is slid up and down on shaft 41 and with each downward slide forcefully contacts collar 42 momentum is transferred from slidingweight 20 to tool bit 60 via bore stem 30 as tool bit 60 is pounded into the ground front frustoconical portion 61 forces soil to the sides of thebore forming a bore with compacted walls when the bore is so deep that end 44 of shaft 41 is adjacent the surface of the ground tool drive means40 is disconnected.