I need to remove a small section of previously installed crown molding, without boogering up the ceiling and wall in the process. The section in question meets an outside corner of 120* and the person who installed it mitered it as if it were a 90* corner, then left the corner incomplete. The pieces of crown are too long and unwieldy for me to take the whole thing down and reinstall it myself. The only thing I can think of is using a cutoff wheel of some sort on a Dremel tool. But have never had much luck with those flimsy wheels. Any other thoughts?