I've not filed the teeth down but I'm going to check now how easily the plate goes onto the shaft,I also didn't use an allignment tool - I just did it by eye, I did it by eye previously (when the engine and box were both out) and the box fitted back on easily then, I am going to get a clutch allignment tool just incase though. Even if the clutch wasn't alligned properly I think the shaft would still go partly on but I'm not getting anywhere at all, I think it is the the postioning of the box - it's just so bloody awkward and at the moment I am doing it just on my own.