You actually don't want the flexwatt to REALLY be touching your tubs. Constantly opening/closing will wear away the plastic on the flexwatt and eventually expose the interior wiring, which could result in dead snakes, melted plastic, or a fire. Reducing as much friction as possible on the flexwatt is a good idea, and why on belly-heat I intend to replace my flexwatt every 2 years or so.
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