got it! loosen the string and slide it over to expose the grub screw. Adjusted and all is right with the world!Basically there's a grub screw in the saddle. The saddle floats, with the grub screw loosened you just move it manually back and forth where you like, then tighten the screw. String bears down on the saddle, keeping it down on the deck, and the grub screw stops any movement back and forth.
Be careful when tightening the screw again as the act of tightening causes the saddle to move slightly. You’ll see this when you do it. Just make sure to adjust to compensate for this.
It occurs to me we should add a video to our YouTube channel on how to adjust these.
Much easier than I had originally thought