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shops use a specific bit to drill. it alows them to go down only so far. if your mounting them your self, goodluck with out a jig(the object that allows them to get your binding on straight and in the right place). measure how far your screw will go down in and drill just a little less than that i guess. its kinda hard doin it with out the propper tools. poor wood glue in the holes to help dry rotting and stregthen your mount. as far as mounting true center, my shop just takes a tape measure dnd does it that way. unless the skis sais true center