The sight on the 513M was a bit twisted off perpendicular.
The sight is fairly simple.
It mounts on a dovetail milled into the breech.
The main reason it's twisted is the elevation screw bears on one side of the sight and there is enough play in the pivot that it twists upwards on the other side...
The elevation screw underside.
One screw is both the pivot and the mounting screw for the sight base.
Screw, knurled nut, spring and elevation screw. Notice the dimple that locates the spring.
The base slides off.
The leaf sight is mounted as a unit to the elevation bracket. Notice the little dimples and the screw that bears against them? You can adjust side to side for gross windage, and there are two rows so you can alter the presentation of the leaf sight...
Angled back...notice the burr on the end of that screw...
Or perpendicular...
The sight unit.
Fairly simple again, just a screw, stamped sight and spring in a tube.
Machined from solid round stock...
More to come...
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