I had a wonderful flight this morning per my earlier email. I went back tonight to work on some squaks. When I turned the prop I got a big surprise. I am now getting a rapid clicking as I rotate the prop.
http://youtu.be/Rw2AP5qkiLA
At first I thought it might be the mags hitting the magnet, but the clicking happens every few degrees of rotation, and has nothing to do with where the magnet is. The sound is definitely coming from the area of the flywheel (back of the engine). It is definitely not coming from the valve covers, nor does it seem to be coming from inside the case.