the fixer I just bought had the dreaded hole in the gas tank from too long of a bolt, here's how I fixed it
used a spot weld cutter (a small hole saw in a drill) that you can pickup from an auto body shop.
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after removing the threaded plate you have access to the hole to be repaired.
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clean around the hole with sandpaper or emery cloth then cut a small chunk of sheet metal (clean this also) to cover the hole.
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apply soldering paste to the tank and sheet metal and solder in place.
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DO NOT USE A TORCH TO SOLDER!! Use a soldering gun, the small ones probably won't make enough heat to get the job done.
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check to be sure you've got the hole sealed after soldering.
lastly solder the threaded plate back in place and your done.
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by using a soldering gun you don't have the worries of a gas tank explosion like with welding or brazing.