I'm about to adjust my primary chain. I've removed all chaincase bolts and pulled the outer case about 2cm out but have stopped because it feels like the alternator wire is preventing the case from coming off. It's still got the gear lever to pass through it. Is it safe to pull it the last 1cm or so? - I don't want to damage the wiring. Or must the rubber grommet at the top of the case be pulled off first to free up the wire? - the grommet is very tight in it's groove, almost glued in. Please see the attached photo to see how far I've got.