On Apr 13, 1:26*pm, "Bob La Londe" wrote:

Ok shiny was probably not the best term. *Smooth is more important. *It will
have a low pressure pneumatic seal with am o-ring and piston. *The raw tube
works ok, but I was thinking with a better than mill finish the o-rings
might last longer.

So far I have not worn out an o-ring with the existing units, but I would
like to make future ones "better."

Paul Schiller has the right idea. Ball size. MSC sells 10 1 inch
balls for $13.6x . So not too expensive to try it. The 2 inch dia
balls are not so cheap.

Dan