I have seen a few chart/map holders on various posts, and thought I would post pictures of one I made from surplus material and installed in my 9A. It folds up against the sidewall when not in use, and clears the stick in extreme maneuvers.
This is the one I installed. Mine is in the center, so I can write on it and the passenger can also see it. If you only need it for charts, this is a good way to do it. Oh, by the way, no need to reed the whole thread, the stick does not hit it.