provided an interior housing means 32 which as seen in the top view in fig2 is a solid metal housing which fills the entire inner space of annular housing 16 providing only space for the gearing mechanisms as will be discussed further solid internal housing 32 adds further support to shoulder plate 26 in supporting shaft 18 and itself is supported on its lower face 34 at the juncture of housing 16 and the lower housing 36 of the tool as that lower house threadably engages housing 16 at point 38 having an upper face member 40 for supporting the internal housing 32 thereupon face member 40 and housing 32 are rotatably engaged for preventing housing 32 from rotating within outer housing 16 therefore in general the entire tool 10 is comprised of basic exterior housings 12 16 and lower housing 36 to make up the total exterior housing of the tool turning now to the internal gearing mechanism within intermediate housing 16 and solid housing 32 reference is made to shaft 18 as it is directed down through the tool and threadably engages a lower connector joint 42 located between the tool 10 and the bit 14 shaft 18 at its upper portion further.