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Ah, thats better.
Can I suggest when you make the off-axis for the 8", it somehow accepts the same filter as the 102, as this will save you making two. I have made them as described, using cardboard and they work well.
Lately though I used PVC pipe fittings, and also spun a couple up from Rimu (a New Zealand Native timber).
Either way try to get the film flat, but if you end up with a wrinkle or two, fear not, it doesn't make much/any difference.
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