Tip for Centering
If you use pipe clamps to glue up a solid-wood panel, it's important
that the clamping pressure is centered on the thickness of the panel.
If it isn't, you'll end up with a buckled panel.
What I do to center clamping pressure is fit a dowel that's the same
diameter as the thickness of the panel between the clamp jaws and the
panel (see Photo). The dowel redistributes the clamping pressure so
it's centered on the workpiece. The result is a perfectly flat, glued-up