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I've had one of rhe SuperMagnetMan magnets in my non-dominant index finger for about two months with no complications. I can't detect microwave ovens, but I'm generally pleased with the sensitivity. The implant is placed off of the center axis of the finger, allowing me to grip with that finger even with the magnet in place. Prior to implanting, I soaked the magnet in 91% alcohol solution to sterilize it. Do not use heat to sterilize these magnets as it will ruin them.
In all fairness to Stave Haworth, I believe $100 is the fee for both the magnet and the implant procedure, which seems reasonable to me. I did the implant myself using the ice bag method of anesthesia. If you need more pain management than that, get the pain management kit from dangerousthings.com and follow the instructions carefully. You don't want to accidentally inject lidocaine into a blood vessel where it can be carried to your heart and cause serious complications. I used superglue to close the wound. If possible, have someone on hand who can suture the wound for you using sterile sutures which can be bought online. This is a much more secure closure than superglue. If you do use superglue, check it twice a day to make sure that the wound is still closed and apply more superglue if necessary. Whichever method is used, keep it in/on for a full ten days.
It's also a good idea to get a box of large sterile gauze pads at your local pharmacy to cover the table you are working on.
Once you're prepared, you might want to do a dry run to make sure you have everything. Let us know how it turns out.