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Check my guide MacBook power cord 5 pins Magsafe connector and cable Replacement
Are you talking about the ends of the cable ?
If it is the case, just strip a little bit no longer than 3/16" of an inch ( like 3mm ) you have to make sure it is not too long; you can see at the step 8, there is no room on the other side of the board.
And heat it to apply soldering on it so it looks like the picture, it is easy to insert and it weld solidly.