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Hi Graham,
If your pole inserts are already made for 25mm x 1.6mm then that would work well.
Increasing the diameter of the poles has a much greater effect on their strength and rigidity than does increasing the thickness of the aluminium.
The modern trend from those who want bragging rights is to use carbon fibre poles, but to be honest it gains very little on a telescope other than a slight weight saving and I wouldn't consider the truss poles to be the heavy part of any telescope. If you use the right sized aluminium poles they will do everything a carbon fibre pole will. They have served the telescope making community very well for about the last 50 years.
Cheers
John B
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