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Put the copper wire through here
Adjust the size of the hole using something like a tooth-pick
* The rough side of leather is inside, not the smooth side
so providing resistance
After putting the wire through like this,
adjust the resistance with the screw
Too thin to see ? ... It's the thickest one (0.15mm) I've got !
Wind the wire 3`4 times around the starting point
Use a little instant glue to make sure of it
The rotation direction is, the upper side moves away