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Now ! it's the turn of this tool at last

First, rough-sanding using a tool like this

* Adjust the spining-speed comparatively fast at this time
The cheap variable-speed drill works well !
Smooth the string off lightly in this stage

Why it is possible to grind precisely..........??
this is the answer !
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Seeing is believing...click the button above
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* Adjust the spining-speed comparatively slow in this stage

Measurement using a micrometer......

Marking with pins ifor example yellow=too enough, blue=not enough)
* The diameter of the strings using this my method
has less than "0.01mm"error
!!
It is very simple but very effective !