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Be aware that there are two types of taps, a bottoming tap for tapping a hole that does not go all of the way thru. A hole tap is for a hole that goes all of the way thru the metal you are tapping. You can make a hole tap into a bottoming tap by carefully grinding the end off. Also some tap cutting oil is a good idea. Go slow and back up often and clean the hole and tap every full turn or so. If you break it off use a carbide dremel tool to cut it out by cutting thru the center section a little at a time until it falls out. Carefully done you can go back to tapping again after it falls out. A magnet is nice to have to clean the tap and hole of shavings. Good luck
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