Is there a lot of play in the pulley???
taking the snout off is really easy and I would suggest using ZZP's
http://www.zzperformance.com/zzp/pro...sc_coupler.htm
I've never had to rebuild the blower but have had it off a few times (cam install and swapped a p & p housing). Hopefully its just in the snout and not the rotors themself. It basically breaks into 3 main parts
Snout
Rotors
Housing
That's all I can think of.
Tim