OK, now when I turn the spur gear it will bind the gears occaisionly, but if I just turn the clutch bell it seems to be ok (I have replaced all spur gears and the bell). I would hate the gears to bind whilst running. What lube if any, should go on the spur gear teeth and what should I use to lube the diff? It appears a huge opening underneath the diff is not going to allow much fluid to be held in there.
If only CEN would make a Manual available online I would not have to ask you so many basic q's.

Really appreciate your knowledge,

Chris