Leupold FX-3 Owner's Manual page 22

To reposition the dials on VX-7 riflescopes:
1 . Unscrew the adjustment cover until it "pops up," fully reveal-
ing the adjustment indication markings and set screws .
2 . Loosen the set screws that surround the top of the dial portion .
3 . Move the cylinder dial by hand to align the zero with the gold
witness mark at the base of the cylinder .
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4 . Secure the set screws .