What Joe90t said. "Hot Stuff" is a brand name (basically known to guys who built model airplanes.) but there are many brands of cyanoacrylate. If the pieces are separated, use the "thick" CA. Be very,very careful not to get any on the finish. If it's a crack in the wood, you can sometime use the "thin" CA and let it bleed down into the crack. It works by capillary action, the same way a tree gets nourishment when it's growing. Though it works best with very porous wood like balsa, it will also work with walnut and other hardwood.