ok, so the cassette is finally off the wheel!!! i wanting to put a 10spd 105 cassette on a campag vento, but it wont fit. the vento wheel previously had 8spd sora on it! i have been told it will fit, but the cassette is too "big" and i cant tighten the lockring back up! help!!! thanks p.s. i have tried it without a spacer behind the cassette! thanks!