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Present Andres and I have been working on new plate holders based on Dinesh's and Colin's designs. We started with 3.4" aluminum, milled a channel through the center with a table saw. In my case I used three passes to get the right width since I use 3mm glass and only two passes for Andres' since he uses 2mm. We then drilled and tapped 10-24 and 1/4-20 holes for the various bolts. It took us a couple of days to complete them (it was bloody hot in the garage so we mainly worked on them at night) and while they aren't perfect they are an improvement over what we've been using.
I'll get a picture of the finished part once I get to a point where I'm not using it.
Among other things, I've been playing with more abstract holograms. I've done a variety of transmissions using foil, flat white cards, mirrors etc just to see how they behaved in white light. So far I'm quite pleased with the results although the pictures don't do them justice. For one thing, they're all extremely bright with normal room lighting and nearly blinding in sunlight. They also have interesting shifting patterns of color as you move the holograms.
Made a new mirror mount to go with the new frame over my table. Sorry, in a hurry so I'll post more details later.
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