Ok. Did as you both said and it worked. Still though why did the gun empty itself when it was pressure locked? Was pressure locked for last 5mths until i found a tidy hammer spring and the guts to have a go. Thanks for the advice both. And tinners thanks for the info on how to change the valve. Much appreciated. Show not over till the fat lady sings though. Lets see if she hold pressure over the next week or so. Cheers guys. Chris