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Ian,
This is adequate for visual use where mechanical support of the gear is really the only thing needed , however rigidity/stability is the important issue for AP to transmit all vibration and movement to ground and depending on the height of the pier, a greater wall thickness and larger diameter is the way to increase the rigidity.
The byproduct of this rigidity is greater strength which is unnecessary, but you cant get the rigidity without it.
The extra cost is almost insignificant especially if you buy salvage/recycled gas pipe which is commonly available and its unseen.
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