Greasy wheel

[buswarrior]

Well, you have three places to leak.

The rubber plug,

the seal between the bearing cover the rubber plug goes in and the hub,

and on the inside, the axle seal.

The axle seal is the evil one, since you won't see it until it has goobed a lot, and it usually goobs onto the brakes, which has safety implications.

oh dear...

happy coaching!
buswarrior