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I read about using segments of (used) wound strings to act as properly shaped files for accurate bridge and nut adjustments. Since I am in the process of doing a Guitar to Mandocello Conversion, I have some surplus Guitar strings. I cut sections of the two largest diameter strings and glued them to used ice cream sticks. This is how they look .... how they perform later as the project proceeds.
@ Raywells: I don't really see any advantage to this method if you are using it for violin nut and bridge notching. I find it hard to believe that a guitar string ( even round wound ) will cut into the nut of a violin as fast as a proper file. Another disadvantage I see, is that even if it would/does cut the nut, trying to find the "exact" string location would be hindered by the shielding of the wide popsicle stick. One more thing, if the stick is meant to act as a depth gauge, I mean filing until the nut or bridge touches the bottom of the stick, you've filed too deep and the notches will be much too wide.
I would just invest in a teeny tiny file rather than cutting up 3 or 4 good guitar strings.
Just my opinion.