Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2872448.

The design ideia is from emeraldmeadows (https://www.thingiverse.com/thing:2419239) i just made some minor changes to the concept.

The holes in the box and lid are tight enough to use a tap. I use M3 screws for the box and M2.5 for fixing the ceramic sockets to the LID. You can also use Nuts if you prefer but you need to drill open a bit the holes.

The discharger in question is this one: https://bit.ly/2HH1LAa