Set screw included for zero locking
Using the small hex wrench included with the package, you can set the zero lock, only if needed.
Attention: The DDHQ zero set screw should only be used if the zero is not holding. If needed, you can turn it 1-2 times clockwise to further lock the zero, only if it is not holding.
The set screw should never be turned until it is "tightened". It is a free floating screw and you can risk damaging the unit if turned more than 1-2 times clocwise.