As to changing or filing the plug, it would be wise to first learn how the transformer is wired internally. Stated otherwise, does the wire from the wide blade (which should be the white or neutral on the 120-volt line) in any way connect to anything but one end of the primary coil? I would not assume that it does or does not, but would want to know how it is in a particular transformer. If there is no way it could connect to any parts of the transmofrmer other than the end of the coil, it's probably safe to reverse the polarity of the two wide blades by replacing the plug.
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