Alright, I decided on what pulley i'm gonna order, but I have a question.. This site says you should use their special pulley removal tool (which will cost $130 bucks and some change total to RENT, which includes the 100 dollar core charger that's refundable, and $124.00 to buy)
Thrasher Press-On Supercharger Pulleys: 3800 Performance

I was wondering if that tool is 100% neccessary?