1. take out cocking rod by turning counterclockwise.
2. insert 3/16 allen wrench into hole where cocking rod was (IVG)
3. turn clockwise to raise velocity, turn counterclockwise to lower velocity
4. take out allen wrench
5. insert cocking rod
6. chrono marker
7. repeat if necessary
clockwise = the way a clock turns
counterclockwise = the opposite way of a clock
keep in mind that 1/4 turn of the allen wrench yields apprx. a 30 FPS change.
Grey - Back Block
Green - Bolt
Purple - Cocking Rod
Red - IVG Access Hole
Blue - Pull Pin