I think because its free ill use the 33.7 X 3mm wall and bore it out on the lathe.
I cant find a short piece of 2.5mm wall locally so by the time i have either bought a 3m length on-line or a shorter piece on ebay with p&p i may as well of bought the pre turned ones from Saturn. Unfortunately I have a lot of time and no money so the free option is favourable.
Andy
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