the second side of the frame allows a third template size those skilled in the art will recognize that placement of recesses of sufficient width and length to accommodate appropriate blades in alternate sides of the frame with appropriate positioning of the pivot for the blades would allow sizing of the template to a plurality of widths and lengths referring again to fig1 the frame is attached to the workpiece by driving a nail through the keyhole apertures 32 and into the workpiece as shown in fig2 the corners of the third side of the frame are recessed in the region of the keyhole apertures the shaft of the nail is accommodated by the slot portion 34 of the keyhole for mounting of the frame which is then held in place by the head of the nail to remove the frame from the workpiece the frame is displaced to locate the nailhead in the circular portion 36 of the keyhole aperture allowing the frame to be lifted off the workpiece after removal of the frame the nailhead will be spaced from the workpiece allowing easy removal the recesses 38 in the corners of the third side prevent interference by the fastening nails with the cutter portion of the invention which interfaces the top surface 40 of the frame as will be described in greater detail subsequently positioning of the frame on the.