Little by little an instrument gets built. Seems like a hundred little details must be attended to. For instance the fret ends must be smoothed out.
And it is much easier to do it before the fretboard is attached to the instrument. This tiny file is rounded on the bottom so that it will not score the wood of the fretboard. Lots of frets to smooth, Have patience.
Can you see the ones that have been smoothed and those that have not?
Did you wonder why two fret slots were left empty? Because a hole is drilled in them to accept a tiny brad that will hold the fretboard in its proper place when it is glued and clamped to the neck. The fret will be put in later and cover the brad hole.
The fret boards are glued and clamped to the necks.
And after a few hours, and a little work with a rasp, they are beginning to look like ukuleles.