I was on craigslist lookin around and found a vibe for 50 bucks....only thing is it had a air leak. So I took a gamble and got it. The kid said the leak was from the reg. He hooked up a bottle to it and it shot the velocity screw right out the bottom on the reg. So I called a buddy who knows his stuff and he said buy it and ill take a look at it. Took it to him and put the velocity screw back in and hooked up a tank and found no leak at the reg but it was at the board. So he took the marker apart and found it was leakin from the little black cylinder on the board. The kid i bought it from said it was only used one game and it started leaking. So after taking the black solenoid thing apart it was noticed that the o ring was pinched upon factory installation....it didnt ruin the o ring just wasnt seated right. After a little oil and finesse put it all back together and it works like a charm. So happy I took the gamble and bought it.