If this is for that little press tool that you are having such problems with I suggest you use a root rather than tap M2, see special blade punches on the link below and you will get the idea.
You will get the best results using a rigid drill press for alignment and a spiral bottoming tap such as used in CNC equipment. I have always used Rapid Tap lubricant for the best results.
Make sure the work is clamped and you only go a quarter of a turn at a time and back off to break the chip...don't get greedy and it will work. I wouldn't go a full 70-75% on the thread, 50-60% Max!
Tapped lots of D2, you sure you want a 2mm threaded hole...thats asking for trouble! I wouldn't do it, I would find another solution....like a through hole and a recessed threaded insert in the bottom side. Keenserts work great for this type of application with a drop of red locktite instead of using the punch tabs to lock it. To use the Keensert you thread a 50% hole not a 70-75% full thread, much easier and safer to tap.
goign to go with an m3 instead. thought i needed to have screws flush with part so was countersinking plate but it's ok to use shcs's. can you provide a link to the keensers you mentioned? cheers.
