Quote:
Originally Posted by emmsone
With the braces curved on their underside and the back glued to it, the back can't naturally flatten out horizontally, but the typical centre reinforcement can't naturally hold the back in its dished shape, utilising this floating back brace is one way to counteract the natural flattening and add a bit of rigidity.
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I don't believe the back "naturally" flattens, unless there is some change in RH. If that's the case, the additional brace may not help.
I'd also recommend using reverse kerfed linings, or solid laminated linings next time, they make the sides so much stiffer you don't need to worry about flexing when you glue on the top and back.