I have a few NOS latest-style Jaeger single-lever side mounts available, with several different base styles. Here are some photos of one of the mounts with a base machined specifically for a large-ring Mauser.

And a back-side view.

These mounts are apparently the latest/last Jaeger style and have a rough but effective windage adjustment incorporated into the rear ring mounting in the form of two opposing set screws. I have several different styles of bases including ones for Mannlicher-Schoenauers.

I have only a VERY few and can supply them to the brotherhood on a first-come basis for $225 each, with your choice of base styles and the oversize mounting screws as shown in the photos. Also have a few spare parts such as NOS unmachined bases and NOS 1" ring top halves only (to replace worn ones you don't want to paint or anodize).
Regards, Joe

You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!