That lens cell needs to have no reflections. Flat black paint is one solution but I wanted to not change the dimensions. Hence using blackening compounds that promise they are non-dimensional. In this case, Birchwood-Casey Aluminum Black. This is really for fixing scratches on your AR15 but dunking the cell in it and leaving it there for an hour seemed to be adequate.
The label warns that it is corrosive. I did not feel any effects but watching the aluminum bubble in it tells me that there is some acidic reaction under way.
The next step is going to a friend with a retaining ring wrench to put the ring at the back of the lens.
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