accommodate screws and an elongate tubular member 220 having a base end 224 and a terminal or cutting end 226 the device has connector means to enable the tubular member to be connected to the base member as described base member 210 comprises a surface contact or first side 230 and an opposite second or top side 232 and has a central bore 238 of slightly larger diameter as the external diameter of the tubular member thereby allowing the tubular member to be slid therethrough on the surface mounting side 230 of the base member and around the periphery of the bore 238 is provided at least one slot 242 that extends partially through the thickness of the base member but does not communicate with the top side 232 in other words there is at least one slot around the bore periphery on the surface contact side of the base member that does not pierce through to the top side of the base member the base end 224 of the tubular member 220 includes at least one protrusion 246 that correspond with the slot or slots 242 and having a shape that is complimentary to the corresponding slot s for a snug friction fit therein as exemplified in fig9 the protrusion 246 may comprise a rod 251 that is slightly longer than the external width of the tubular member being passed through diametrically opposed holes 253 and 255 in the tubular member such that the ends of the rod 251 extend beyond the tubular member alternatively protrusion s 246 may be otherwise formed on the base end.