15-09-2017, 05:06 PM
I guess its there to make a seal between the shaft and the housing, to prevent grease from the gears leaking out. It will go in with a bit of brute force but as you say it shouldn't make much difference - I've never suffered a leak like that and as we all know, Sevens will usually expel lubricants at any opportunity!
Alastair
Alastair