I was going to make a video, but I think a few words will suffice.
To tighten a loose fret, move the fret up to a very loose position
until you can push one end of the fret through the knot. Pull it as
tight as it will go just as you did when originally tying the fret.
Usually you will get only a few millimeters of extra. Now, burn the
existing bit with a soldering iron or match or flame-thrower or however
you make heat. Put the fret in position. Now you'll never have to use
ridiculously lame shims under your frets again.
The very first time I put frets on a lute as a kid I said-"oh, you can
tighten them if they get loose." And ever since then I've wondered why
people use shims, or even the completely baffling practice of replacing
loose frets. "Do they," I wondered "replace their shoe laces every time
they tie their shoes?"
Maybe I'm a dreamer, but I think we can end this strange shims and fret
replacing practice in our lifetimes.
Sent from my Verizon, Samsung Galaxy smartphone
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