Hey Stana
First, Congrats, what a nice set. I'm happy that you obtained the bases. The issues you pointed out are actually .....small issues.....most of these bases are lost.
This might sound crazy, but, prior to starting any project, If it was me, I would somehow use your bases to make additional bases. In that, there are many people looking for these bases.
As you more than likely know, there isn't an adjustment on either the rings or bases for windages on these kind of claw mounts. So the only method of adjusting right/left was tapping the front base. Accordingly, soldering is totally out and both the front and rear bases are dovetailed, respectively into the front receiver and the receiver bridge. I strongly suspect, viewing the quality of the drilling made to the rear base, that this was done when the rifle was original fitted (1) with this mount. In that, at the time, this sort of dovetailing still required handfitting, but even the smallest error still might allow a small amount of drift. To correct this sight drifting, a dovetailed mount of this kind would simply require a small screw threw the base into the receiver.
I'm not sure of your location, but you should obtain the best gunsmith you can find only because this project will require a lot of skill in cutting the front and rear dovetails.
(1) This may have been done afterwards, but by a very skilled gunsmith. If you can ask the person you purhased it from.
Again, what a nice scope and base
John
