Jones if you are going to bend the ally then its good to anneal the ally first, you may already be familiar with this process so ignore if you are but if not then to make it act like putty (very easy to bend in your fingers) try this.
The annealing is easy to do with an acetylene torch first light the acetylene to give a sooty flame don't use the oxygen just yet, run the sooty flame over the ally surface covering in soot but not too thick as it takes longer to burn off now turn on the oxygen to give a blue flame and run this over the sooty surface about six inches off and don't stop the flame moving as the ally will melt very quickly, once the soot has burned off the ally will be at the correct temperature for annealing which i believe to be 700 degrees which is virtually the temperature ally melts, then leave to cool to room temperature don't quench as you will undo the annealing process.
If you don't have acetylene at hand then a gas torch will do with some liquid soap smeared over the ally surface, heat the soap until it turns black at which point the ally should be at 700 degrees and the annealing process is complete and allow to cool.
Good look and i look forward to seeing the finished gutter profile.
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