I was having horrible noises coming from the AC Compressor. With some help from this forum and the service manual I pulled off the clutch pulley and replaced the bearing. Not very difficult at all - remove he 8mm bolt from the center of the pressure plate, pull out the pressure plate, remove a snap ring, and pull off the rotor/ pulley. But now that I'm putting it back together, I'm baffled: the bolt in the center of the pressure plate threads into the pressure plate, not the splined shaft, so there's nothing that holds the pressure plate in place, it could just walk of the end of the shaft. From the service manual, it looks like the bolt is only there so that you can replace it with a longer one and press the pressure plate off the shaft if need be, but it's not an interference fit - I can easily push it on or off by hand. What am I missing here?
It's a '89 4Runner 3VZE if it matters, but it looks like half of all Japanese cars use this same compressor.

 

On the 10PA15 (1994 pickup) sitting on my desk the bolt holding the pulley screws into the end of the splined shaft. So I guess I can't help you.

 

Yeah, that would make sense and is what I expected, but on mine the shaft just has a small dimple for a gear puller to get the rotor off.