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· Old School
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A glue up should be comprised of pieces that are straight and square edged and mate without gaps. Using a media as a non slip device could keep the joint from closing. Brad nails shot in or hammered in would have to be very short and cut on an angle to penetrate the mating piece. If one or more is skewed at all, it could prevent closure.

A well fitted spline, or the use of cauls will keep the alignment. It should take just enough clamp pressure to get a tight joint. If the boards are not flat, or cupped or bowed, where excessive clamping is needed to get them to mate, you'll have a constant tension on the joint.

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