energy source seat 22 the energy source seat 22 is then screwed into the top of the projectile tool body 1 after assembly the tool is in a fire ready mode threadedly attached to a drill string and lowered into a well bore and downhole cavity in a well bore cavity the tool can be partially opened by rotation of the drill string and or by engagement of the end of the blades 2 with the rock bottom of the cavity whereupon by drill string weight applied to the tool against the bottom of the cavity the blades 2 can open to a position perpendicular to the drill string whereby the latch hooks 14 lock the blades 2 in said position ready to fire the tool is then raised or moved to the level desired to fire the projectiles 3 into the formation the electric battery 23 energy source or other trigger mechanism is then released or lowered into the well bore whereby it seats and activates the igniter 10 and explosive 7 which propels the projectiles 3 outward into the rock or subterranean formation upon firing and setting off the explosive 7 the main force is applied to the projectile 3 but a small force is applied to the small drive pin 19 in each blade 2 which pushes the drive pin 19 outward from the blade 2 and against the latch hooks 14 whereby each latch hook.