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If memory serves, aluminium alloy has unusual annealing properties.
Again, memory is vague but I think its due to the copper content in the alloy.
I definitely remember something about "age-hardening" of these alloys, with copper being the culprit.
So if these are old they may well be much hardened and could do with re-annealing before bending.
Maybe you're familiar with this but if not, a quick google might be worthwhile.
I also remember Roger Almond (customs) saying on a tv build-off programme that he annealed ally before bending it and I think his method was to blacken it witth an acetylene-rich flame, then heat until the black carbon burned off indicating that the correct temp had been reached, then (I think) quenching.
Dunno whether any of this helps but it can't hinder, eh ?
Thanks for the info.
And good luck.
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