Originally Posted by
HoGo
What John said. I see a cross-brace, so if the humidity dropped (more than a few percents) then the top shrunk across width but the bracing did not (wood doesn't shrink much along its length) so the curve appeared. For such sensitive tops you need to know where your humidity is when you glue bracing on or you can get some surprises - this time you are lucky it hapened before assembbly. If the top stays like this in normal humidity (50%) then you need to remove the bracing and glue new braces when top stabilizes at that humidity (or slightly lower, 40-45%)
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