was wondering if your valve is like mine and sticks first few shots if the valve sets for any small amount of time , minutes , takes several shots to get the valve opening with out sticking and making weak first few shots , starts out several hundred ft low and climes with each shot , , takes 3-4 shots to get it shooting back up , just wondering if others had this problem , when i first ordered it they kept sending it leaking , and i would send it back right away and they would forget to fix it then some one would send it back and same thing , but finally it came back after over lots of months and it wasn't leaking ! but its sticks , even just sitting in my drawer i cant just walk up and push the valve open with my thumb until i break it free with something hard to push against , and push hard ! hoping Motor head has a thought ! or any one who knows