Torque.. the cork limits how tight you can pull the assy together. It's not hard to push the cork out of place. Also the argo flange can bend which tends to pinch the cork at the holes. I use either locknuts or locktite on regular nuts. Look at the cork. Check how centered the outer seal is on the axle, use the nuts to pull it around if needed. I assy and then drive it some, then retighten. The cork will compress. I keep rechecking.
I use sealant on the bolt heads.
Can't grease it too much, it's just a wiper seal w/o a spring.. it's common to push water out of there when you grease. Can't hurt the seals with a manual grease gun.
To Invent, you need a good imagination and a pile of junk. (Thomas Edison)