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I need it to not affect the diameter as much as possible.
It's sold in rolls.
And, google says heat it..   so I know heat would soften it, but, then there's diameter.. 
Could try soaking it in hot water
Would it just return to straightness,  or do i need to apply pressure..
The problem I'm having is ,  I don't know of a way to apply Even pressure, which may cause odd formations.