violin slotHere's a gnat's-eye view at the face of a nut as seen from the leeward side of the second fret. The slots for these two strings are cut so that they completely support the string. The sketch aboveMore on bridges in due time, but the principles here apply to bridge slots on the viol and violin families, guitars, mandolins, and so on. Here's a page on the files and so on you need to cut nuts.