cheers test rider, very thorough explanation
But... i thought id give the solder method a go, given that if it works its a lot less labour intensive and if it didnt work nothing lost as ive got spare channel anyway, ive also got shit loads of old solder ive acquired that i never use!
so first thing using a small blow torch i melted the solder into the channel, i made sure i filled it completely as initially it wasnt flowing under the lip which is where the support is needed most.
I then tried to bent it, i initially made a small jig from wood but the wood was too soft and allowed it to try and bend in the wrong direction.
in the end I just gripped it in a vice and bent it and used some vice grips to support it and prevent it from bending in the wrong direction, which worked a treat!
I then heated the solder up and ran it onto a block of wood, i then reused the solder for the next bend.
beginners luck as well, i managed to bed it to the right shape first time!
really pleased with how it turned out, so thanks for the suggestion Rovering Member, seems your not going nuts!