woolwich

Hi,

I would be grateful for your thoughts. A friend has called with an old Pearson frame in 531 tubing. It has been in a smash and has what has been described as a badly bent rear mech hanger. The local bike shop are not interested in attempting a fix stating that it is 50/50 whether or not it will shear if they bend it cold, they advise heating it up. I have oxy/acet, dropout alignment handles and mech alignment tool.
I am looking for any tips on how hot to get it or any other basic info that will give the repair the best chance of long term success.

Thanks in advance