I have a Hatsan Striker 1000 Vortex Gas Ram .25.It has been sitting for quite a while, so I tried to shoot it, when cocking it when limp.So I opened it up and it has a Vortex 3 gas ram.When I push in ram piston by hand it goes in easily and does push back out without much force.I assume the gas ram went bad.I have tried to find Mikeyb stuff here on GTA but without alot of luck.I have a Crosman NP2 ram if it would work, or I have some coil springs for conversion.Does the Vortex 3 gas ram allow refill thru the end hole ? ( I do not have a fill probe yet 8.8 mm ? )Or what dimensions would conversion to a coil spring be ? and how to mount an end cap to hold spring in ?Or how do you make a NP2 gas ram fit ?Alot of questions - so thanks for any help and guidance.