Mantis Stereo Microscope Long Working Distance (SLWD) objective lens adapter

I use my Mantis stereo microscope to do a lot of soldering, and one of the difficulties when working on high density boards (BGAs, tightly packed 0201s, etc.) is that it's hard to get the soldering iron(s) and/or hot air tool at the necessary angles because the microscope head is too close and gets in the way.

There is an official long working distance 6x SLWD objective from Vision Engineering meant for rework, but it's very expensive, so I decided to try making one myself with various optics