ok, nice, I'll try that out, and see how it works. Thanks. Another quick question. In a lot of diaphram guns and piston guns, people use a thick rubber, hard material. What is this material and where do I get it?

Thanks
Mitch

very cool gun. I was looking at the link that clide posted. I was wondering what kind of cup to use. Obviously it has to be plastic, but how thick and flexible does it need to be?
Thanks
Mitch