You can't really tell from the pictures below, but the day after I cutout the transom, I was shocked to find it curled up on my table top the next day....curvature was enough that there was a 3/8" gap between the straight-edge and the middle of the transom, shown below. It was really more drastic that it appears in these photos. If I pressed the top of the transom flat to the table, the bottom would be lifted off the table surface about an inch.
What I didn't know was that after cutting the shape out, the board should have been left standing on end so both sides can absorb moisture evenly....but, I left it laying flat on the table, and the result was the cupping. Not knowing that yet, I went ahead and dry fit it to my backbone and left it like that overnight. With both faces exposed to the air, the next morning I found it was nearly back to a flat surface. Now, a couple of days later, it is just about perfectly flat again.
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