A couple of weeks back I bought a saw screwdriver from Lee Valley. Made by Grace USA, this screwdriver is made to fit slotted saw screws.
The handle is made of unfinished hardwood, in a classic style with a square profile with rounded corners. This prevents it rolling off the bench. The driver has a 0.35″ wide tip, which has been ground to a parallel consistency of 0.032″ thick.
The parallel tip prevents damage which might normally occur due to tapered tips, which fit poorly, and also reduces the screwdriver from slipping and marring the handle of the saw. Here is an example of using the screwdriver in one of the saws I one day hope to restore.