Gday Steve
Just for info ( as yr in Melb ), i have found Capral Aluminium to be an excellent source of small dia alum tubing, but if you want larger sizes
( including true 2" OD that fits into 2" fittings ), you can also try
Light Spars of Australia in Moorabbin. They do a whole range of thinwall, high tensile alum tubing for yachts and hanggliders etc.
They have a range of inch size tubing that fits one inside the other with minimal slop. Very good for making miscellaneous bits.
Andrew
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