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Re: Two pressures?
I understand your intent now... your clarification got sandwiched in between my read and my write. I don't know what your mechanism actually looks like, but would it be possible to leave one side of your pneumatic vented and just use a bit of surgical tubing for the extension?
I'm not sure what the technical term is, but I know I've played with cylinders that had a spring loaded extension and a pneumatic retraction. I couldn't tell you if those components are FIRST-legal, but you might be able to cobble a reasonable facimile together. Then again it might not be worth the added complexity.
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