Duet WiFi case 40mm Fan Mount

Decided that while I wait for my blower fans to arrive, I'd use the 40mm extruder fan that came with my Monoprice Maker Select v2 to cool the duet. Turns out it pushes more than enough air to cool the drivers.

I used a #4 nut and bolt to connect this to the case, as the #4 nut is what fit aussiephil's case bottom exactly. You'll notice in the pictures the washer didn't sit flush. it's actually a #6 washer as the hardware store was out of #4s. Not sure if a #4 would fit right, or if it's even