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I had the same problem.
I cleaned and dried tank, wound a long bolt in to open out the hole into the tank. Grab a 6mm x 6mm long grub screw, coat it and the internal threads (using match stick or similar) with JB weld. make sure you work the JB into the threads, get it bonding. Screw the grub screw in till its about 10mm deep, If you go to far just fish it out of the tank and try again. That's it, let it cure. As the grub screw goes in it cleans the JB from the thread so you don't need to re-tap it. I did all of mine and no leaks in 3 years, and m tanks been on and off a billion times!
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