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The flaw with my suggestion is that the sight drums wouldn’t ‘lock’ into any position, as it would with the serrations on the sight base.

If it were me, I would knock up a concept of what I wanted using some aluminium channel.
Or if you know how to use a Computer Aided Drawing (CAD) program, I’d try to design something in that.

But...

It is a collector’s piece.
Whatever you do with it, try not to do anything permanent to it, just incase you need to move it on.