Please take a look at linked photo. Looks like someone tapped holes located above plunger (completely through the thin plate). Have no idea what type of sight was previously mounted on this old Wilson Bros. BW 1225. As you can see, the hole configuraton is not in-line vertical and it looks like an additional tapped hole is needed to accept an Accra type mount that would accept an aperture. Any other ideas?n
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oh, BTW - nice place you guys have over here.