vale assembly making certain that all the proper o rings are installed put the collet in through the top of the check valve assembly and tap in with an assembly tool insert the spiral lock ring into the gland located inside the upper housing lower the mill body over the entire check valve assembly and milling core using a u201c tap in tool u201d strike the upper end gently until the collet bottoms out inside the upper housing this will be about one inch of travel insert the four ball bearings through holes in the upper housing place a small amount of grease on the ball bearings to hold in place if necessary using an insertion retraction tool screw the tool into the collet located inside the cva assembly which will shoulder at the right depth put base plate on the shoulder of the assembly and screw on the nut provided turn the nut clockwise until the collet is pulled up against the spiral lock ring this is exactly one inch travel prior art mills have shear set pins which can be damaged and can result in the mill being released into the well this results in a fishing job and additional cost this can not happen with this invention referring to fig2 the process begins by placing a junk mill on the bottom of a tubing string and placing the junk mill in a well block 50 then the tubing is hooked up to a kelly and fluid water or drilling mud is pumped down the tubing block 52 the tubing is lowered until the junk in the well is contacted block 54 now 2 barrels per minute of.