The Tactical Elevation Knob instructions are as follows:
These can only be installed on Our TACTICAL STOCKS:
Turn stock upside down. Remove the two screws from the grip cap. Set the two screws aside as you will be using them to install the Tactical Elevation Knob. Use allen wrench or similar “L” shaped item to insert in one of the grip cap holes and pull up. Remove grip cap. Install Tactical Elevation Knob in grip cap hole.
Press new grip cap on Tactical Elevation Knob in place. Re-insert the two screws that you removed from the grip cap. Tighten till snug.