If it's just one isolated fret, there is a way to fix it that was in the magazine a few years back, if I remember correctly. you need to get a hole saw, and a sanding drum with matching diameters, so the drum could nearly fit inside the hole saw. The sanding drum is used to grind out the fret, and the hole saw is used to cut a plug of new wood to fill the hole, splitting off what you need to fill, then whittling it to flush with the bow. I think the author used Resorcinol, but Urac or smooth on should work. When finished, the repair looks like a bite was taken out of the belly, and replaced. I used a similar method on a black locust bow I built in Afghanistan. I pulled up splinters when I was in too much hurry steaming in recurves. I didn't have the tools, so I hand carved the repair, and used fiberglass repair epoxy to set it, and it seemed to be working. I was able to full draw the bow, and the recurves held. Unfortunately, the back failed at that point, so I never got to see how it would hold up long term. If it all sounds like too much trouble, and it most likely is if the bow is only partway finished, you're probably better off just grabbing another piece of wood.