Flip lens holder for Meikon underwater camera housing

This thing attaches a cheap-o macro filter to a Meikon underwater housing for my Sony a5100. The Meikon housing has threading that can hold a 67mm lens filter, but I wanted to be able to quickly add and remove the filter, and this makes it easier when underwater and possibly wearing gloves.

The parts all push fit together. They are a snug fit and may require a bit of sanding/patience. I used a piece of 3mm filament for the hinge pin.

The macro filter I used was one of these, but I assum