I previously mentioned on this forum that I had fabricated a tool to make the job of pulling out the water pump impeller easier. I have uploaded a picture of the device to the photos section. It is relatively easy to fabricate. I can make these for $35 US and would be willing to have a bunch made up if anyone is interested. Or feel fee to use the concept and make your own. I used stainless steel for the "jaws" but the basic locking pliers are plated mild steel and can rust so precautions need to be taken to prevent that. After each use I rinse mine in fresh water and treat it with Boeshield. The great thing about this tool is that it does not damage the impeller in any way nor does it mar the pump housing. Since it locks in place on the hub of the impeller it won't slip off and skin your knuckles (after having done that a few times I was so mad I decided to build this tool).