Norm,
Much thanks for the reply and explanation - is always appreciated and never taken for granted. :-)
Will grab a seal and replace - I'd bought that semi-fluid grease as well but loathe to put in if I could stop the leak, drained the gearbox this morning - was a tad surprised to find it only had around 450ml of fluid in it, as I'd only recently filled it up to the brim and it's meant to take 750ml.
Little surprising as I've been keeping a container under the seal between uses and the leak has been rather slow BUT I suspect that when in use the leak is worse, so likely dropping more fluid then.
Thank you again. :-)
