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I suppose we could re-engineer the whole tube, but my 2 cents would be move your Telrad, one tube ring on the inside side of the focuser, the outside side has the tube end piece close so you shouldnt get too much movement there. Then you could get a piece of rolled Al in the inside near the focuser, cut with a whole for the focuser to sit through, bolt it to the focuser and the tube ring. Your rolled Al would need to be at least 1/3 the circumferance of the tube, as per Brendans formula.
You could also get the gear to do it carbon fibre
For the price ($60), I would start with the tube ring and see if it improves, you will find the flexure under weight is distorting the whole tube, not just the focuser area.
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