These value seat cutting tools are easier than ordinary type cutters in assembly and handing for precision cutting work. Remove the value cap or flange and fit the suitable cutter to the spindle. Then, set the fixing bed using a tightening bolt for the cap or flange. Check that the cutter fits horizontally with the valve seat and is in the center position. At this point you set the adjustable screw to find the best position of the cutter. After adjustment, begin the cutting operation by turning the handle clockwise. In case of slant surface cutting, please refer to the following drawing.