Basically the author cuts a ubolt in half, uses some scrap for the end with a knob, and bam, fence post clamps for a table saw. Its a cheap method to do this, but…I have seen some fence post clamps on amazon for a bit less than the materials here. So…if you have everything already, worth doing, else, if you can wait. Check out for buying one.
https://www.homemadetools.net/forum/56-u-bolts-make-best-fence-clamps-shorts-tip-93479#post212153