I bought a Kratos in .25 cal and really enjoy shooting it but filling is a pain. I started with a hand pump and quickly moved to a GX CS2 pump. The problem is the fill port on the gun is recessed in the stock and the pump has the block with the gauge just large enough that my fat little fingers have a hard time connecting and disconnecting it from the fill port. Sometimes it connects just fine and others it doesn't seal and wont fill. What do I need? I see all kind of potential problem solvers but being a novice and this being my first and only PCP, I could use some direction. TIA.