One method of finding the position of the piston inside a non magnetic
cylinder is to fix a small magnet to the piston and use a wristwatch compass
moved about on the outside of the cylinder. A ring of iron wire around the
piston as well as the magnet may make it easier to find. On a plastic
cylinder a "stud finder" will sometimes work.

Colin Smith

----------------------------

Yes it might.

I always have made the piston out of  plastic as it is in an equal
state environment it does not suffer the stress of unequal
environments. The pressure both sides is always the same.

As for locating the piston actually that is not really the issue.
The trick is to work out where the piston must be under the full
operating temp and pressure. There is a way, but I just have not
pointed it out. Basic phyics and the laws of
air pressure x volume (hint) as well a couple of really basic
homemade tools the homemade tools will take about 5 mins to make
will get it where it needs to be. Once you know these and set
it up the piston postion is not really an issue anymore. :)


Regards David Gaze

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