Here's my take on a fret wire nibbler for bound fret boards. I didn't have the nibbler tool, but I did have the dremel and the stewmac base. I use a piece of acrylic with a hole bored into it and a slot to take the fret wire. I clamp the dremel upside down in the vise with the cut off wheel just flush with the acrylic. Frets are rough cut to size and marked with a fine point sharpie where to nibble to. Then the fret is slid along the slot and tipped up in one quick motion to trim and cut off the base of the fret. I dunk in a cup of water quickly because it gets hot, then do the other end.
Nelson
Nelson