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We decided we needed a simple hand tool. I created a tool with four aluminum corners with two cartridge heaters in each corner in order to deliver enough heat quickly. (This drawing only shows one heater per corner) The four corner blocks are each mounted on a parallelogram so that pressure will be evenly distributed. The operator, after adjusting the temperature setting, simply places the repair tool into the lunchbox and presses down for 15 to 20 seconds or until the corners have been reformed and the glue has set. The beauty of this tool is that it requires only hand pressure and the timing for each bag repaired is adjusted as needed by the individual operator.