Bob, There dose not seem to be any set standard for the across flats of the hexagon screw in bushes that retain firing pins.I have at lest 10 custom made wrenches sold/supplied by gunmakers for removing these bushings. None of which fit the same hexagon! You can try the adjustable wrench approach all to often the jaws tend to be too big as a result they slip and damage the hexagon.My recomendation is to purchase a small inexpensive wrench that you can by filing, open up the jaw to fit the hexagon on your Scott bushings.
