It won't disengage while trying to spin the back tire?
Are you saying that, in order to tighten the bolts that you need to put it in gear and then without the motor running, the clutch won't disengage? Like trying to push it while in gear is impossible while holding the clutch. I am trying to understand the symptoms. The inside is turning without the outside turning with all the plates and discs in there?
The splines of the hub are all the way meshed. Teeth are meeting with the ridges on the inside, behind the big nut. It has that washer with the teeth, too right.
You can see pressure plate moving when pull the lever?