What type and size is the head of the throttle body idle stop screw? I'm talking about the screw that butts up against the throttle to control the minimum idle speed. The head of this screw is down into the passage, and I can't tell if it's an Allen Head, Torx Head, Phillips Head or just a flat blade (slotted) head? Anyone have a stock throttle body currently off of their car that they can look at real quick and tell me what to use to adjust that throttle idle stop screw with? TIA for all replys.

 

Its a T15.

 

Thanks Fred!