I don’t know how else to post it, but it is simply a piece of plywood with a plane ol’ Screw at the pivot point. One issue is it won’t be perfectly smooth, so you would need to sand it. A CNC would cut a smooth edge, but if you don’t have a CNC, then that’s a huge cost, and big floor space. The slower you go, and the sharper your bandsaw blade, the smoother the cut will be with a bandsaw. Use double stick tape to keep the stacked pieces together. It shouldn’t take much force with a decent bandsaw, so the tape doesn’t have to be much- just enough to prevent the pieces from slipping.
Another option is to cut slightly larger and then use a straight cut router bit to trim to a smooth edge with a circle template or a circle jig on a router table- basically the same jig as on the bandsaw.