Thanks to Weggy, Tim Crowther and my mate Dave (who owns a 500 which is currently 'under restoration' for coming along to laugh and point. Morini now has both clutch oil seals replaced. Yes, it's a relatively straightforward job, and yes, it's best to have some people around to voice second or third opnions. because there are definitely some areas where reassembly isn't quite as logical as you might think. And buy two of each seal, in case we nadgered one on the rebuild, was a wise move because yes, we did. There was some oil in the clutch area and on the plates. I've cleaned 'em up with contact cleaner, and I'll see if that works. If not, then it's new plates and springs. Verdict on the Morini seems to be that it's definitely OK for the money. Chimay beckons......