how did you get the new one off and on? what was the technique you used?

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Um, a dangerous and irresponsible way - a heat gun and flux to float it off the board. A plain old soldering pencil to put it on. I don't suggest the heat gun method. I think snipping the legs off of the chip, then removing the legs from the board with a soldering pencil would be best method. I just didn't want to destroy the donor chip because I was going to reuse it.