Now the interesting thing is that the new seal is a very different design to the old one:
-Old seal: black rubber, pretty much one solid lump with a seperate plastic ring which clips into the seal.
-New seal: Orange rubber, with a gap between the outer ring and the seal, so that the seal is fairly free to move and easily folded back
Just wondering if anyone else had any problems with the new seals?
I would advise extreme caution when fitting the shaft that it remains perfectly aligned and centred when inserting into the gearbox, and makes as little contact as possible with the seal on the way in...
I have put back the old seal for now, will see whether that holds oil.......
Aaron