This is why you don't put a fret in slot 1 and 14. You drill a tiny hole in the slot to accept a brad that is driven through the hole into the neck to hold the fret-board in place when you glue it down. You put the last two frets in after the fret-board is glued on
Here are the three tenors, all the fret boards are glued on, all the frets are installed. The beginning shaping of the necks has begun. Now the fine sanding, and neck shaping begins. the goal is to make those necks as slim and playable as possible. The width of the fret-board at the nut is part of the equation. The Cape House uke will be the standard 1 3/8ts inches. The redwood uke is for a guy with thick fingers and will be a little larger, not quite 1 1/2. The juniper uke is for a large man. I will call him to see what he prefers. I can make it an extra 16th wide if he prefers. Lots of final sanding and fine work left but that is fun work.