Rich,
I have only had to file the bottom of the slot ("deepened it as I said in my post above). It would seem that the slot was deliberately not milled deeper than an "interference" fit so that it could be individually fitted to the gun if necessary. I have not encountered any attaching irons on which the slot was too narrow side to side, and the sides of the slot are generally parallel in my experience.
Ron
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If it's made after 1918...it's a reproduction
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