I will probably see him next week and will take a picture of the tool for you. It appeared to be a 1/4" thick flat bar about 3' long and he had studs in it to hold the crowfoot as he torqued out the center bolt. I believe he had to use heat on the center bolt to loosen it.
I know this is an older post but if this helps anyone with what I did with my supercharger pulley repair, it will still be a help. I bought my stock 2003 Cobra with worn out supercharger bushings. I could have gone out and bought a used 2003-2004 lower supercharger pulley cage, but still would...