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The bottom (please don't Spoil it) board has m5 threaded inserts every 64mm (X-Carve every 75). The holes along the engraved lines can accommodate 5mm dowels or m4 screws. 5mm dowels can be used to create a straightedge or square to insure that the project material will be parallel to the X and/or Y axes. The m4 inserts can be used for mounting pretty much anything, in this case they are used to mount (w/ 4 - m4 shoulder screws) the removable top (feel free to Spoil it) board. The 5.5mm holes in the top board align with the m5 inserts in the bottom board. The top board can be replaced with with any other board that protects the bottom board from through cuts.
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Spoilboards
The bottom (please don't Spoil it) board has m5 threaded inserts every 64mm (X-Carve every 75). The holes along the engraved lines can accommodate 5mm dowels or m4 screws. 5mm dowels can be used to create a straightedge or square to insure that the project material will be parallel to the X and/or Y axes. The m4 inserts can be used for mounting pretty much anything, in this case they are used to mount (w/ 4 - m4 shoulder screws) the removable top (feel free to Spoil it) board. The 5.5mm holes in the top board align with the m5 inserts in the bottom board. The top board can be replaced with with any other board that protects the bottom board from through cuts.