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If you can get access to under the tub, you can firm it up with a can or 2 of the expanding spray foam you can buy from any hardware store. You may need to find hose to extend the reach of that plastic straw that comes with the can (same hardware store). Find something heavy to put in the tub to weigh it down (I like sand bags). shoot the foam in underneath it, and leave it alone for the full cure time it says on the cans directions. It will feel rock solid next time you go in it.
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