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Bob, I took the machine to the Cardio Lab today for ultasound testing. There was a stack of forms to be filled out when it got around to date of birth, I had to say that it was some time next week. Well it seems that this lab does not do prenatal testing and I was referred to a women's health clinic. when I got there, the place was surrounded by protestors and TV News people so I will have to fall back on more standard methods.Jerry
I think you are missing the point that there is a line contact between the face of the disk and the end plate that moves around the chamber.
If you are interested in my version, a new thread will begin soon.