Thread: Help! Washout Question
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Old Jul 18, 2012, 02:19 PM
BMatthews is offline
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The 'Wack, BC, Canada
Joined Oct 2002
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It's far, far simpler to shim the whole board. Trying to use just the right shim under each rib all along the span is going to pretty much guarantee that the final result will be wiggly like old McGee's walking stick. If the board is reasonably stiff but with enough flexibility so that it can be twisted and clamped down to form the twisted surface then the twist will be nicely and evenly graduated all along the span.

Because you are raising one corner the board will want to be "tippy". So on the two oppsite corners the idea is to either heavily weight them down so they are in contact with the bench top or to clamp or screw those two diagonal corners down to again ensure they are in contact with the bench.

Note that for the other wing to get the proper twist you will need to move the shim and weights, clamps or screws to the adjacent corner. You can't build both wings on the board with the shim in the same spot or one wing will be washed in and the other wing washed out. And that's never a good thing....
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