machines/howtos/cool-stool/step_1.md

Drill holes

Then, you have to drill holes on the both sides of the 180mm beams.

Drill two separate holes and then pierce between them to create a single one. The hole must be long enough to insert the nut. Be careful to not broaden it too much.

TIPS : you can drill the corners with a small drill bit before you drill the big one.

Next, drill the other beams with a 10mm large bit.