Another tool, this is one-time use only, applies to removing mechanical clutch from a dead Gen III truck water pumps for those still using the mechanical/clutch fan on the water pump.

Need to get that fan off the old dead water pump? Don't have a the Spanner wrench or your strap wrench wont grip tight enough, or wedging piece of wood between the fan belt and a pulley not working to break the fan loose from the water pump?
Remove the pump withe fan attached, unbolt/pry off the back cover of the WP, find an old LSx head bolt or other 9"+ long scrap steel item , weld the bolt to the pump shaft so that as the shaft spins the bolt will catch on the pump legs holding the pump shaft while you break the fan free from the pulley.