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I had a phone call the other day from another guitar tech looking for a way to get a stripped nut off of a Takamine.  I came up with the idea of treating it like a pin chuck or mandrel. A pin chuck is used by pen turners (and machinists) that want to be able to turn a closed tube without a tailstock. A mandrel that is slightly smaller than the diameter of the tube and long enough to go into the tube and chuck, is used.

A flat spot is filed or ground on the side, the length and diameter  of the pin. ( I used a transfer punch and a finishing nail with the head cut off for my first pin chuck) When it's inserted into the tube the pin goes to one side or the other and jams in place. There's more pictures and a video on my blog.

http://www.gtrdoc.com/2017/11/do-you-have-solution-for-stripped-tru...

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That's a good one!

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