Thanks for the prompt feedback. Not what I was hoping to hear, but...such is life.

I took it off the rifle, and I do see an additional hole drilled and tapped through the inside of the frame in the area of the elevation slide. I had also noticed from the get-go that the windage slide, set on zero, was waaaaay to the right of the bore's centerline. So, perhaps it was indeed adapted to a plate. At the least, now I have an idea how to do it!

In the meantime...time to put a Britishicon knurled safety lever on my DCRA Longbranch and get out the spare PH5C.
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