Ok, now i'm stuck.

Pulled the cowl off to have a look.
Managed to pull the clutch/drive plate and associated assembly out of the machine as they appear to be warped. The drive hubs also seem to be lose on the axle.
How much can these be warped and still functional? I figure i should replace the clutch fibre plates while i have it out.

The main problem is though, that i dont know how to take the drive/clutch plates off the axle. I can see that they are held in place by collars that have screws through them to stop them moving. Even with the screws out they dont move due to age and a small amount of rust i guess. Also do the bearings at the end require to be pressed off etc to remove everything else?

I dont suppose there is anyone in Brisbane who could lend a hand?