Restting the zero scale on a Swede AGA Sniper scope

Hi i could use a little advice on the resetting the elevation scale on my AGA scope.
The elevation ring has a knurled section with one large set screw and a smaller section with three tiny set screws around the periphery.

I sighted the rifle in at 100yards but now i need to know how to reset the adjustment ring, Do all four screws need to be loosened or removed? Does anything special have to be done with the ring other than rotating the scale to the proper distance mark?

Any help will be apprecated. Thanks.

Jim

Was there anything helpful in the MKL?

Swedish Rifle Manual for Model m/96 m/38 m41b (sniper)

Regards,
Doug