Andre,
This is ideal.
The angular deflection for a nominal load (eg torque load of mount, wind, cable drag, imbalance etc) will result in less than one arc second
In your case its actually under 0.5 arc secs - and is what I would consider perfect, even for imaging with image scales under 0.5 arcsecs per pixel with top end equipment.
There is no need for any gussets on this pier as your rigidity is already within ideal levels, but having a base plate of 10-12mm thickness to bolt it to the ground would be a good finish to transfer that rigidity to the ground.
Good luck with your imaging
Rally
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