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Sounds like a great idea, thought I'd just make sure you knew that it had been done, but the idea of re-engineering a new mechanical safety sounds excellent.

Would be another interesting cross...

Great idea...it has been done though, many, many years ago.

Here are two that I've seen:

Stahly Live Blade Wind-Up Razor Model 6

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And here's another wind-up that I've seen, both are...