Many times, I have been on the side of the road without a screwdriver, or the one I had one was too small. Now I carry a pliers, and some change: a quarter, dime, and nickel. Many small screws on a car like the idler screw can be turned with a dime, and the next bigger ones with a nickel. The larger ones can be turned with a quarter. However, you need the pliers for torque; so don't forget that part of this tip.
Hope this helps!
Source: Tried and true from years of experience not having tools when I needed them!
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