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There may be flexure but with the front of the OTA within 25mm of a solid ally ring and the tube ring about the same possibly only a little bit more and a steel tube (the skywatcher are better built than GSO even though nobody believes me) and the fact its running OAG, you don't see the flexure. Further to this the footprint of the 3" focuser i think is 130mm^2 so it pushes that loading over a decent area.
Balancing the scope I generally have 23kgs thats even with the focuser on the underside of the OTA.
The stars show no flexure in 15 and 20min sub exposures so im a happy trooper.
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