1.  Place the PCB in the enclosure

 

The PCB sits flat inside the open‑face enclosure.

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• Make sure the PCB is fully seated

• The outer lip of the enclosure should sit slightly above the PCB edges

2.  Insert the four screws
 

Use the corner mounting holes in the PCB.

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• Drop one M3 screw into each corner hole

• Ensure the screws pass cleanly through the enclosure and PCB

3. Install and tighten the nuts
 

Secure the PCB to the enclosure.

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• Thread an M3 nylon‑insert lock nut onto each screw

• Tighten until the PCB is held firmly, but avoid over-tightening