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Peter,
Try your local scrap steel yard. It doesn't matter if the pipe is not shiny new. I got a 1.6 m scrap length of 275 mm dia x 6 mm pipe, cut it to the length I needed, and after a few coats of paint, it looks great. More importantly though, it's quite stiff. You might also try a large engineering works or steel fabricator to see if they have any scrap.
BTW, the local noon shadow method worked a treat for me.
Chris
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