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Vance, a spring might work, although the pressure applied would be
constant, not variable as would the external pressure of the surrounding water
at depth. But on the other hand, a spring loaded compensator would be
inexpensive ( my Scottish side is showing here ) and easy to maintain. If it
leaked when you weren't down deep, like at the dock or on the trailer, you'd see
the oil being pushed past the cylinder seals.
Frank D.
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