I have the Weigand mount also.
The set screw in the front keeps the elevation set. Just don't torque it down. Tighten only until it touches the frame.
I wish they give a nylon screw for this, the metal screw does mark up the frame.
The mount is weak, i dont' think it was designed for anything with more kick that the 22 mag.
I am sending my gun to Ruger to rebarrel with the 7.5" hunter barrel with integral scope mounts. This way i have regular sights for back up.