Check the work piece from the point 3 and point seal 4 seal properly or not.Put the workpiece Jig that each 1 piece push piece into end, butt the edge inside of Jig.
Check specimens derived from seal to seal the three points and four correct or not. The specimen put one piece of the jigsaw pieces into pressure to stop the inside edge of the Jig.
Check the material received from that point 3 seal and points 4 seal that is correct or not.The work on each 1 jig pieces. Push the workpiece into the end of hitting the inside edge of the Jig.