This stop is held in place by two dowel posts that fit into the bench dog holes. I based their hole and slot positions off the holes in my bench. One post is adjustable, allowing this stop to fit even if there’s a variation in bench hole spacings.
That rod is threaded on a bolt while the other is fixed with a wedge. An aluminum bar reinforces the hardwood of the stop, guaranteeing I won’t break it when I really get working.