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I just got these. I highly recommend scooping up some of these dirt cheap (got 2 for $13 on eBay) Coghlans dynamo flashlights. I've had one for about 5 years, it's still working perfectly. One minute of winding gets 7 minutes of light.
I don't know what else will wind up on this, probably my small ferro set at least. I won't have any need for keys soon.