Hi dear

Good evening.

It's Tracy from Red Win Optics. We would like to submit this video guide for how to install zero knob of Red Win 1x20 Red Dot for your reference.

It is easy to go with the below steps.

1. Remove the sticker.

2. Apply the glue ( Any type LOCTITE for screws is ok), oh don't apply too much or you need to clean it after finishing the installation. And pay attention that don't put R on UP.

3. Make the postition of inner tube to be a conventric circle with outer tube by adjust zero knob.

4. You finished it. Then it's better to use your item after 2hours ~24hours for fully dry the glue.

If you need more clear video please visit https://youtu.be/wQ43m98NX3w

Thank you for the support and should you have any queries please feel free to let us know.

Best regards

Tracy

Red Win Optics