I am taking my first elk hunt this October and have a 300 Win Mag as my rifle. I dug a mostly unused Leupold VX 1 out of the gun safe to go on this rifle. I have been working up some loads and now I want to mark the zero placement on the elevation. On my tactical and long range scopes I can take out some allen screws or just lift the adjustment knob. I do not know how to do this with the VX 1 though. Any help would be appreciated.