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The next step is to surface sand both sides until the thickness is exactly 5.0mm.

In this picture, I have laid out the dimensions and locations of the bass bar; drawn on the inside of the plate in pencil. Since I have angled the grain of the top plate on a diagonal, the bass bar is similarly angled with the bass bar passing directly beneath the left foot of the bridge.

I use two spring clamps to hold bar in position and if this is not enough (as in this case) add clamps to just remove any air gaps. Pre fit the bass bar so you know exactly the steps you will make once you begin the gluing operation. Let it dry overnight in a warm location.