Useless, I have another method that might be helpful for you. When I feel an urge I will wait 20 minutes, and then, if I still feel like cutting I will, though I won't cut deep. I will cut maybe 4-5 shallow lines. Deep-cutting needs do arise, but normally I can curb over my need with the 20 minute method.

I'm not saying this will work for you, but it helps me a bit.