Flywheel loose?

Hi Everybody,
I've just done a 12v electronic ignition update on my series 2 Li. When I tighten the flywheel nut as much as possible I still find that there is a little bit of rotation of the flywheel (about 1mm) before the crank starts to turn. Is this normal? Is my woodruff key liable to sheer? The flywheel sounds quite noisy. Any thoughts greatly appreciated. Cheers Alex.
I've just done a 12v electronic ignition update on my series 2 Li. When I tighten the flywheel nut as much as possible I still find that there is a little bit of rotation of the flywheel (about 1mm) before the crank starts to turn. Is this normal? Is my woodruff key liable to sheer? The flywheel sounds quite noisy. Any thoughts greatly appreciated. Cheers Alex.