Is the back naturally so warped that you couldn't just work around it? I have to wonder about using any method of forcing something like that in a way it doesn't want to go - seems like at some point it will always go back where it wants to be and pull things apart, or at least introduce a lot of stress.
Maybe at some point a new back isn't such a terrible thing, if the original is just going to compromise the rest of the instrument.
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