I have a custom STI I will be using for USPSA matches and am looking into pinning the grip safety. Has anyone ever done so, and if so, how simple is it without a drill press? I have seen many of the videos and read the information on how to go about doing it properly rather than just cutting off the tab that engages the sear, but has anyone her done this, and if so can you provide any tips? I like the idea of pinning because it is non-permanent and can always be undone to use this pistol for IDPA, etc., or to sell it.