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I was hoping that instead of magnets, it would just be extremely heavy, and be able to activate an internal gyroscopic system to do something like this: https://www.youtube.com/watch?v=GeyDf4ooPdo

It'd be pretty hard to fit all that in a small package though, and probably dangerous.

That's not how physics works. If the hammer is too heavy to lift, putting a flywheel in it isn't going to change that.

I was hoping he'd just made a really really heavy hammer, and happened to be strong enough to lift it himself.

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