Is there a trick to removing the big nut that holds the front sprocket on? How do I lock up the engine to loosen it? I know about putting rope into the spark plug hole, but that might not be the best thing for the WR. I know some guys swap out sprocket sizes pretty often, so it must not be too hard, but I haven't do it before and don't want to wrestle a lot with it or break anything. Should I use Loctite when replacing it?