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I am "constructive" in the sense I suggest to get inspiration from these "glands" ! Although it is such a basic idea that it has already been done here.
My advice is not for you, in fact is is useless but for others so they don't waste their time ! So much useless junk published here, one has to help "customers" isn't ?
Such a "desing" from an "engineer" deserves a kick in the a... and the pinlk slip !