I'd start off with clamping it to a solid, flat surface for a day or two. If that doesn't work repeat with a shim in the centre of the bow so that you're bending it past the resting point. You're unlikely to get it 100% but should manage most of the way there. I can't guarantee that you won't crack the new finish.
I'd start off with clamping it to a solid, flat surface for a day or two. If that doesn't work repeat with a shim in the centre of the bow so that you're bending it past the resting point. You're unlikely to get it 100% but should manage most of the way there. I can't guarantee that you won't crack the new finish.