HA! BEEN THERE AND DONE THIS!
IF YOU GET THE SCREWS OUT OF THE PULLEYS(VERY QUESTIONABLE) THEN YOU GOTTA GET THE SHAFTS OUT OF THE PULLEYS! which is going to be a whole lot like wrestling a one-armed-man! (please forgive me in advance if I am offending anyone

)but I'll tell you how to do it.
number one, are those pulleys worn at all? if so just replace them. not too expensive. not worn at all? you gotta soak them for a good while in penetrating oil, and then be careful you don't strip the allen key holes trying to get the screws out.
number two, if you get the screws out, take the pulley/jackshaft to a shop with a press and have them pressed out.
trust me on this one. I'd lie about a FISH or the BABES but never about a jackshaft pulley.
GEO