Im not following you here mike? Chicago screws are the large, double sides screws. One head, the one that is the threaded rod, usually has a slit in it for a straight screw driver, and the other side, the female side, is smooth. TKS and sheffields has them.
I think you mean Torx screws. halpern titanium sells a wide range of screws, as does TKS, and most of the knife supple houses. Ask for button head Torx 2-56 screws or whatever size you need. Good Luck! BTW, i'm still interested in that damascus..ill try to catch you on IM to talk bout it.