That wasn't going to cut it, the inner diameter of what he used was tiny, maybe 3/8" I really don't know how that even worked. There was a gasket shoved in the middle of one too lol.
So I spent some time looking around for a bulkhead solution that would fit in these holes. Tried one idea I had and it wouldn't work. Decided on a thread through design with a female fitting on the outside, and a o ring gasket on the inside. Problem was I still couldn't find anything small enough... so I just made the holes bigger for what I had ordered!
It was nerve wracking but it worked out really well.
Bought a set of diamond grinding bits for my dremel, was like $13 shipped. And the result: