My Dear Friends,
As an aside, to all of the karambit users or user-wannabes, a bit of advice, if I might.
#1 - Get a trainer. In fact, if you are *really* intelligent, the trainer will be your *first* purchase rather than an afterthought. They can be easily made from an old cutting board or cut from aluminum stock and rounded off, but if you plan on getting silly with a karambit (spinning, etc.) a trainer will make a significant difference on the volume of blood leaving your body.
#2 - If you practice with a karambit, you will eventually get silly with it. You will ultimately decide to extend and retract it, spin it, etc. Please refer to rule #1 above for sage wisdom from one who has been bitten, and often.
#3 - If you train with a karambit, you will eventually have to put the trainer down and run with the live blade. Yes, I know what I typed above, but the simple fact is a trainer will almost never be exactly the same weight and balance as a live blade. You need to know how YOUR blade responds in YOUR hands, especially under stress. You need to actually HIT things with it to see how it rebounds, and that you can still control it and keep it from biting you. I train with a live blade *every* day. The live blade training is limited, I admit, but at some point every day I have a razor-sharp karambit in my hand, practicing combative techniques.
#4 - If you train with live blades, YOU ARE EVENTUALLY GOING TO GET CUT, especially if the blade in question is a karambit. Bet on it. It IS going to happen, so be prepared to deal with it.
#5 - (And I can't stress this one enough) If you own/train with/carry a karambit, SEEK OUT TRAINING FROM A COMPETENT INSTRUCTOR! 99%+ of the individuals who publicly deride the karambit are simply utterly ignorant of this tool and its applications.
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Hannibal