There’s been a few discussions on the buttons available for the Cole jaws and how they do/don’t work for a particular project. I’ve attached a couple of pictures of what I’ve been using for a BFB to hold the glue up while I recess the bottom for dovetail jaws so I can flip it around and turn the in and out sides. Simple clip from Baltic Birch and a metric bolt. Sorry I don’t remember the thread size but got em from HD.