Using an old volume potentiometer and a Radio Shack knob, I build a turret for my scope.
Caution, with any DIY mod you will have to take your time and there is always a chance of ruining your dust cap.
DO NOT MODIFY A LOADED WEAPON, CLEAR YOUR RIFLE AND REMOVE THE OPTIC.
Step 1: Potentiometer
Use a small screwdriver to bend the tabs and a pair of needle nose pliers to remove the case.