Bill Tindall, E.Tn.
But since I have no direct experience using this joint or the drawing tool, having only watched the chair person pin in what seemed a more straightforward way, I thought I must be missing something.

I have noted that the responders mention clamps. Yet my query was how to use the $100 drawing pin that is supposed to avoid clamps. While the cleverness of its geometry for the task is interesting, I remain befuddled how it is practically helpful.