BREAK + REPLACE THE REDSTONE TORCH NEXT TO THE HOPPER POINTING IN TOWARDS THE DROPPER. MAKE SURE THE HOPPER IS POWERED!
Today, we're going over an expandable quarry design that can be adjusted from any size up to 256x256 easily, and up to 512x512 with 1 redstone link relay point. This quarry took me 100 hours to design, so I hope you like it and enjoy!