I bought this fret-slotting box from Stew-Mac. This is actually
the very first time I've ever actually slotted my own fingerboard!
(Previously, I've just bought pre-slotted fingerboards.) It wasn't
as difficult as I thought it would be, actually!
A while ago, I had bought a small slab of ebony from my local
hardwood store, so I resawed it so I had a 3/16" thick board.
I then notched the fret positions with an Exacto knife and sawed
away! The fret-slotting box has some adjustable guides so you
can control the depth of cut of your fret saw. I found rubbing
some candle wax on the saw as I cut the slots helped it go more