Holding the handle of the program grid, keeping the multi-blade cutter perpendicular to the plane of the test piece. Cutter spacing and cutter types: 1mm and 2mm with 11 teeth and 3mm with 6 teech. If it need to replace the multi-blade cutter, use the screwdriver to unscrew the two screws on the cutter body and change the cutter, affix the edge of cutter to the handle, then tighten the screws.
eBay