Power adjustment for Urbans

[jimmykay]

So I have been reading on Gta how to increase power on the Gamo Urbans I was getting 740fps 18.52 h&n on my friends chronograph and would like some more pepper. After removing the stock and airtube cover I tried turning what’s described with the 4mm hex and it won’t budge. Do I Need to grab the key with pliers. Is this the right thing? I don’t want to break a rifle that has harvested a lot of game.

[jimmykay]

So I got it to budge and backed it out ccw 15 rotations and then forward 18 or 19 rotations cw it appears to hit the spinners harder, it’s harder to cock but I want know for sure until you go back to my friends with the chronograph...

[MB]

Clockwise all the way in is usually around 13 to 15 rotations, but you are on the right track all the way in CW is full power