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Waterplug can be found at ACE hardware, it's a quick setting cement used to plug cracks in a basement and is supposedly completely waterproof. BruceK left us some to play with, and I've been using that since November. It sets in less than 5 minutes, depending on the amount of water. Awesome stuff.
Aquamend at Home Depot will work as well, but you get the best value per pound with the waterplug. Use the zipties and coat hangers as a skeleton....or acrylic rods if available- I'm cheap