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To remove the clutch, all you need is an 8mm socket. I used a 1/4" drive...easy enough.
As mentioned earlier in this thread, to remove the nut without the clutch plate spinning, turn on your ignition (without running engine) and turn on your a/c to engage the clutch plate, this will allow you to remove the nut. No special tools required.
Korg, as far as troubleshooting, what is yours doing? Testing the pressure is easy. Most auto parts stores and even walmart has a pressure guage that easily slips on the schrader valve on the accumulator and will let you know the pressure while it's running. Or you can by the refill for about $30 that comes with a pressure guage and complete instructions right on it.
When your AC is turned on, does the clutch plate engage the compressor? In my case, the pressure was low, so the compessor would cycle on and off by itself. I just let the truck idle in the driveway and I could watch the compressor clutch engage, then disengage about every 10 seconds. I refilled the system and as the pressure came up, the compressor clutch engaged, and stayed engaged like it is suppose to. Problem solved.
As I mentioned, since I was screwing around anyway, I removed the shim to bring the gap down to .035.