There is sometimes discussion about flat face to flat face glue ups and the slip-n-slide that can bother us. Probably more than one of us has used or at least heard of this method.
I'm building up a small pedestal base like the unfinished and unglued one stacked up in the background. I pre-sand the surfaces that will be tough to get to before I start.
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I drive in very small nails and snip them off with a pair of side-cutters leaving just a nib poking up to grab the next piece. Whether you use 2 or 3 or 5 will depend on the size of your surface.
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I clamp a piece of scrap in the vise to use as a reference surface to align the backs in this case, spread the glue with my customized Rockler gift card glue spreader and stack them up.
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The little spikes on the top of each layer (except the final top surface of course) keeps things from slipping around while I tighten down a couple of cauls.
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Gently now, don't crush the little fella.