Originally Posted by
electrik
The pressure should be somewhere between tight enough that there is no play in the axle and loose enough that the axle spins freely.
Best answer yet.
It is really hard to describe this for some people and is best shown hands on.
Maybe if you have an especially cool LBS they will show you or you could pay them to do it and the turn the axle with your fingers to get a feel for what is "just right."