Select an empty suitable jar from your garbage. The electronics should fit inside, including some spare space on top.
The idea is to cut and fold the tin of the jar's lid to build a holder to fix the board with screws and nuts.
The jar should be cleaned in the dish-washer.

- Take of the lid
- Think about the geometry of the holder needed for your board. Fix it horizontal or vertical? Cut and fold a model out of paper.
- Mark the position of the slits and holes with a marker.
- bore the screw-hole(s)
- cut  the slits into the tin. A sturdy cutter knife should be sufficient. Use a wooden board a underlay.
- fold up the tin

- prepare the wood. Bore holes at the right places
- fix the lid on the boar with screws, tighten with grease, wax or other materia.

Be careful, the tin edges are sharp. Protect yourself, use gloves.

If you made a mistake: Don't bother - just take the next gratis jar from your glass garbage box and start over.