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Spring assisted, and button activated aren't the same thing. Spring assisted is legal. Button activated is not.

And there are a myriad of different engineering hurdles in what you are proposing.....

If it's spring loaded, it probably can't have two positions (and, the technology to pull that off would cost a metric ****ton to have one custom made)

Also, spring ASSISTED is not illegal, that...

Honing aside, it doesn't open up far enough for most styles of shaving... Only far enough to be a knife... That's why, if you look closely in the movie, the bevel is massive...