fieldmaster problem

[Everyinchtheanimal]

Hi guys as most of you have seen I have purchased a couple of pumps, one of which is a fieldmaster.
My problem is that once aired up it leaks down the barrel, what could b the cause of this and what can I do to remedy it? Any help greatly appreciated. Cheers guys

 

[Everyinchtheanimal]

Also am I right in thinking that to adjust the velocity I need to unscrew the internal part of the hammer?

 

[Canon Fodder]

Leak down the barrel is the cup seal inside the valve, you might be able to hodge it with an oring, if the bolts adjustable (ie the middle of it turns) then you screw clockwise to increase, anti clockwise to decrease.

 

[Everyinchtheanimal]

The adjustable part is on the inside of the part with the seer? Where the spring sits on behind th bolt? I will try putting an oring on the valve to see if that helps. Cheers

 

[Canon Fodder]

If you take the bolt out (the bit that the pump handle attaches to) you can tell if it's adjustable if you can turn the inside of it with a big Allen key.

 

[Everyinchtheanimal]

No its not then...shame... how can I get it up then?

 

[Canon Fodder]

Either put washers at the ends of the main spring or replace the main spring, auautococker ones should fit or perhaps one out of airsoft pistol.