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Thank you for more pictures of the rear sight base. I plan on doing something nearly identical to that. How is it attached to the pistol? I see a roll pin there, but I cannot fathom what purpose it serves.
I'll shoot you a PM back soon. However, tonight is late and I'm weary from travel. Having said that, I am very interested.
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the Dewey rear sight base appears to be well soldered to a machined flat that removed the rear toggle original axle bump and sight. the front pin is the pivot point for the elevation on the micro sight/bowen eqivalent. the rear side "pin" near the soldered base line is actually a very small allen head screw that engages the elevation screw threads to prevent it loosening up from the toggle sight dynamics. problem in using elevation screw is that it likely fails - I suspect due to the bounce effect when the sight elevation springs get hammered by the toggle slap against the luger rear frame stop.
the Werle web sight has a reference that future target lugers would have elevation locked down and so elevation would be in the front sight. the pinned blade in your blueprint should allow variable height blades as needed - but the prewar colt woodsman 22 front sight method might be a better as allows adjustments.
VERY interesting project !!!
thanks
Bill