the only possible solution is crappy and probably won't worktoo well if at all I think my friend beasted my 2k that way ( he said he accidentally broke it) , hehe i rhymed, I hope when he finally get's it back to me it won't be broke that way other wise :knife:.
What I do is cut the foam to the lengths I want it, then stick it in an RF20 or WF turret and use a hair dryer on it's highest setting. You want to heat each side (top and bottom) till the plastic is noticeably warmer (warmer not hot). after that just let it cool then finish making the stefan.
There are many ways to straighten stefans. I'm still trying to find new ones, only when I'm bored.