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Carefully place the rail onto the extrusion, ensuring all the T-Nuts fall into the slot.

Align the rail to the center of the extrusion. This can either be done with a 3D printed alignment tool, or simply a ruler or vernier calipers. The measurements for each side of the rail will depend on your chosen extrusion and rail combination:

2020 Extrusion with MGN12 rail - 4mm each side of the rail

2020 Extrusion with MGN15 rail - 2.5mm each side of the rail

3030 Extrusion with MGN12 rail - 9mm each side of the rail

3030 Extrusion with MGN15 rail - 7.5mm each side of the rail

Tighten the first M3 screw at one end of the rail and re-check your measurements. If the rail is still correctly aligned, tighten every other M3 screw until you reach the other end of the rail.

Double check your measurements once more, if the rail is still correctly aligned, return to the start and tighten the remaining screws in order.

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