UPDATE
Today was spent making the Dovetail Base Plate or Saddle or whatever it's correct name is.
It is constructed in the simplest way by using 2.5" x 3mm flat and 2 lengths of 1/2" steel rod.
The rods are welded along each edge off the flat creating a tapered channel for the dovetail to sit in. Then two holes are drilled and tapped for the locking screws to lock the dovetail in place.
It is heavy, but weight doesn't bother me. I'll just add another counterweight!
Here are the pics.
Pic 1: the Dovetail Saddle runs from one ring to the other giving plenty of sliding adjustment.
Pic 2: See the negative dovetail shape created by the round bars.
Pic 3: Dovetail plate and rings in place in the Saddle.
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