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tension cable stiffners
I once had a lightweight 6" f8, where the tube would vibrate like crazy. The solution was to run a cable from the front of the tube down to the base, under a roller, up to another roller held under a tension spring, one wrap around, down to the third roller then up to the mirror cell of the tube. Acted like a triangular stiffner which still allowed freedom of movement. Very simple ; very effective.
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