I've had a couple of rimfire rifle, over the years, that had scopes mounted in Weaver side mounts - one that I mounted, and one I bought already set up.
The Weaver sidemounts are comprised of two different parts - the base (which screws to the rifle), and the ring bracket (which is attached to the scope via the rings/screws).
Both used the same type base, which is/was available in either a flat underside for flat-receivered rifles, or rounded/concave for rounded receivers or barrel mounting - each secured to the rifle via four 8-40 screws.
The base, in addition to the holes for the four mounting screws, has two threaded holes that take the two Weaver QD thumbscrews that are integral to the one-piece sidemount ring/bracket assembly.
When I've had the occassion to remove mine, the scope returned very close to the previous zero, when I checked via a testfire.
FWIW, I'm including a complete Weaver ring/bracket/base round sidemount set with the sale of a vintage scope I have.

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