Hi,
I am asking this here as Frame-builders would know how to manipulate metal.
I have a Cromo stem (130mm Velocity brand). The clamp part is not level, It dips to one side i.e. It is rotated slightly on the longitudinal axis. (This may be due to a crash as the bars that were on it are also not straight. Also because It is unlikely they got past Velocity's quality control that way.).

So I was wondering: is possible to twist it back to normal? For instance, clamp a handlebar, then slip another tube over it to extend the leverage....then force down on one side, up on the other.
Or any other methods?
My Concerns are these:
Would the twist weaken the weld area? or the stem body?
Would heating it make a difference?
How hot does it need to be? (I would like to conserve the painted finish....)

Thanks for reading.