BROOKS BRADLEY wrote:

>                                 Dear Tony,
>                               Marshall also sent me an interesting suggestion,
> for which I am indebted.  It is both reassuring...and greatly appreciated that
> you gentlemen would take the time to volunteer such sincere suggestions.
> Thanks again.
>

I have been giving this some thought.  It seems that a snorkel may do the trick,
it already has an entrained ball in it that can be either replaced with 
something
heavier, or a spring could be put on the top of the ball to adjust the pressure.

Marshall


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