You are welcome Bob.
If that's the 3 screw Nikon base mount, torque the screws from the center out in small increments. Apparently... if they are tightened at too high a value from front to back or visa versa, they may cock on the rail and require excessive amounts of windage adjustment to be used up in getting on target.
Have fun with it,
C
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Shoulder Drive Nicholson Club
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