A one piece valve body incorporates a built in strainer and a ball valve which can be used for cleaning out the strainer without any disassembly, and also serves the purpose of the manual drain that has to be in the system for code. The instrument comprises a body having an axial bore, a piston slideably contained inside of the axial bore, and a plunger coaxially mounted within the axial bore and axially movable between an extended position and a retracted position. The regulating piston is acted upon in the opposite direction by a spring force of a counterspring. The bone penetration section includes a distal bone anchor section which threadingly engages the anchor bone, and a proximal fragment section which fits within the overbore created by the bone anchor section. The present invention includes the link-time modification of object code generated by the compiler or assembler and the addition of custom generated object code to the link for the purpose of implementing far branches and calls without changing the compiler generated instructions or expanding compiler generated object code.