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Do they need spacers? I had some 50mm square ones and they are only 1mm thick and most filters are 3mm thick. Without the spacers they rattled around in the filter wheel and got damaged.
Later Gerd sold me spacers for them once they were ready which they weren't when he sold them to me, plus they cost $100. I still haven't forgiven him for that unprofessionalism.
Greg.
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