Bowden Tube Through-Wall Fitting For 12" Round Drybox

Through-wall fitting for my hilarious but just-fine round top-mount drybox, which happens to be made from two 12" deep-dish flowerpot trays stuck together.

Requires 4 M3x12mm bolts, 4 M3 nuts, and a rectangle of something spongy to form a gasket (I used some thin foam from an Amazon package). To prep the flowerpot dish, I used a 3mm drillbit spun in my fingers to handle making the bolt holes and a utility knife to cut the slot for the tubing. I also had to ream out the holes in the part a l