Thanks Ian. Useful as always! I did revise all this documentation and I'm planning to supervise the works at our dealer's workshop. The mechanic I talked to today was more than happy when I offered my help and more instructions than the simple ones of MMC email.
To make sure again: I'm about to buy this one:
https://www.bearing-king.co.uk/bear...-shaft-oil-seal-with-garter-spring/15744 It's the correct one isn't it? Here locally I'm not finding it, so I prefer to go to a sure source as Bearing King UK.
By the way: is it mandatory to remove the prop shaft? I thought it was splined at front and would slide forward enough allowing to take the bevel box out, won't it?
Shall we loose the rear wheel to release the tension of the drive belt?
Thanks again and sorry for my insistence... but as the dealer's garage here has less information than I do, I better be sure of what it has to be done and how...