My post the other day reminded me that I never actually posted this.
Once upon a time, as a supplement to my Milkman’s Workbench, I made what I called a “planing slab”. It was 6 feet long, 13 inches wide and about 2 inches thick (after several flattenings), with a Veritas Inset Vise on one end. It clamped to my dining table with angle iron, just like the Milkman’s Workbench. And now, it has reached its full potential.

Yes, that’s a second Japanese-style saw horse as well.
I had always meant to add a cleat to the underside so it could function like a Japanese-style workbench. Nothing fancy, like the sliding dovetail shown in the source material. Just dado and glue. I used PVA, so I’m pretty sure it’s permanent.

So tight, it needed clamp persuasion to seat.
The most important thing I’ve learned in this process is that the coefficient of friction on douglas fir is not significant. A layer of adhesive-backed sandpaper on the underside of the slab in front of the cleat or (better yet) on the tops of both sawhorses does wonders to keep the slab in place. A couple of F-style clamps holding the cleat tight against the front saw horse also work.
JPG