Dear Friends, Thanks for your input about the Hydrocel tube. It doesn't sound as if I was unaware of cutting-edge technology, but I was interested that these things do have a history with other instruments. (I personally would have no more put such an item into my violin case than I would have flown around the room, but I guess some would.) Now I know what I'm up against when I see what looks to me like a map case inside a piano and can make more appropriate recommendations. Thanks again. Dorrie Bell
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