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.


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