What is the most effective method for repairing deep gouges in hardwood furniture using the hardest wood filler available?

The most effective method for repairing deep gouges in hardwood furniture using the hardest wood filler available is to first clean the gouge and surrounding area, then apply the wood filler into the gouge, making sure to overfill slightly. Once the filler has dried, sand it down until it is level with the surface of the furniture. This method will provide a strong and durable repair for deep gouges in hardwood furniture.