I received my aluminum tubes from Hastings Irrigation, a few weeks ago. They seem very good--very round and sturdy. I ordered two tubes: first one is 48" of 10.0" O.D. for the main telescope, and the second is 12" of 12" O.D. tube for my novel saddle-mounting scheme.
The tubes were covered in oxide, inside and out. I used rubbing alcohol and a rough sponger to remove the oxide.
The 10" O.D. tube has a wall thickness of 0.064".
The 12" O.D. tube has a wall thickness of 0.090".
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