I managed to persuade my friend to lend me his metal stretcher/shrinker thingy .
now I must point out I have never used on before so I am on a bit of a learning curve here.
here are some of my efforts its not very clear in the photos but these bits of 15mm angle have a double curvature in them very awkward to it get right it took me about 10 hours to do all five doh!
but I am slowly getting there.