I have a Seneca Aspen that quite frankly I sorely wish I never bought. The built in pump is, well a piece of crap. After 2 rebuilds it still binds up basically making the gun useless. Is there anyone or has anyone made a conversion where the pump along with the small air tank has or can be replaced with say a conventional PCP air cylinder. Else this gun may well be parted out for use elsewhere. Any thoughts on this?