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With large truss dobs, we talk about flexure in terms of the truss poles warping slightly under the effect of gravity acting on the UTA. Like other examples given here, it is likely to be more pronounced when the scope is pointing lower.
If used, the TPAS function on the Argo Navis compensates for flexure.
To minimise flexure and create greater stability, the truss poles in my SDM scope were changed to slightly thicker ones several years ago. I haven't looked back.
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