Removing vicous fan

Gotta replace the water pump and it's been about 20 years since I installed the vicous fan. My problem is I can't figure out how to remove the fan before removing the water pump. As you can see in the pics, I've removed the 4 bolts which hold the fan to the clutch and also the four bolts which hold the (silver) shaft to the alternator pully. What am I missing?