Clean and Finish the Notch with a Chisel

What happens here

Once the parallel saw cuts have been made, use a sharp chisel to break out the remaining wood between the cuts. Position the chisel at the edge of the notch and strike it with a hammer or mallet, or simply leverage it by hand as shown in the video, to remove the waste pieces. Work carefully to prevent splitting the wood beyond the intended notch line. After removing the bulk of the waste, use the chisel to clean up the bottom and sides of the notch, creating a smooth and even surface. Scrape away any remaining fibers or unevenness to achieve a clean finish.

Goal: Remove waste wood and create a clean, finished notch