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ThomasEgi : as I said, I have some surgical steel balls (completely safe). so I may try one of those. thing is, where would you suggest to implant it? near the ankle? (I'd go for the legs, btw, they seem easier to me) in a more fleshy zone so pain is not as bad? (...I'm not too concerned about pain, btw....)
I'm willing to look for some lower leg anatomy pictures, and I'd guess I have to look out for everything that it's not plain skin or muscle? (arteries/veins, nerves, tendons...) ... is a shallow cut in a muscle too bad? (I ask just in case....) I mean, I know it's not good, but as long as it heals in a reasonable amount of time with just a bit of care, I'm not too worried...
anything else I should know? read? look for?