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Thanks for the positive comments on my gear, guys.
" I made the mistake of centre marking my mirror with a very small circle - It's right in the middle of the tublug and can't be seen. A bit larger, and it is easily seen on the tublug."
For that reason, people have asked me to make the hole in the center of the screen smaller, but that would reduce the outgoing light flux, and thereby decrease the contrast of the shadow.
It would be possible to make an "aperture stop" of paper or tape with a smaller hole in the center, if it can be accurately centered on the tuBlug aperture.
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