I have a door, about 50 years old, that has a slight warp, maybe 3mm - 4mm.
Door is painted hardwood frame (probably jarrah).
Side rails are 115mm, top bottom rail 75mm.

The diagonal braces in the photo are keeping it straight and true at the moment.
Don't know how long it has been warped for. Frame and door are not from the same house.
Any chance of straightening you reckon?

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