'89 Diplomat. Installing new gear and done it a few times but forgotten where this little rubber O'ring goes. Is it around the shaft that gear goes over? There is a groove there but it doesn't seem like that's where it goes when I tried it but I can't see where else it would go. Comes in the new package and I didn't see an old one when I opened things up. Maybe it was disintegrated and gone. Thanks. Larry