Yeah, just tossing stuff out, that's what we do here ðŸ¤
My bad on commenting in the wrong thread, had no idea! Certainly getting it perfect with the drilling is best, I'm just thinking that planing afterwards to the hole could correct for any errors. After doing that, there should be no issues win laminations running crooked since they are square to the hole .
Anyhoo, to your question here, if the S4S wood is warped, you'll need to lay a straight edge across the boards concave surface and measure the depth at the deepest point. Multiply by 2 to get the minimal wood thickness needed to remove (plane the convex surface flat, flip, then flatten the concave side). If twisted, lay it on a flat bench, hold down one corner so it isn't rocking, then measure the place with the biggest gap above the table. This will be 1/2 the amount needed to remove.
