My daughter and I just made one of these pens. Our blank blew out when we pressed in the magnetic coupler. I think there was something like glue or a burr inside the tube, my fault. Turned off the crack and added a band. I agree I like this pen. I like the magnetic because it leaves a smooth area to grip the pen.
you must not wait for the glue to cure if it took an hour from blank cut to picture.