Final answer:
Larry should use woodworking technique to get a perfect symmetrical finish on his decorative doorknob.
Step-by-step explanation:
To get a perfect symmetrical finish on a decorative doorknob, Larry should use the technique of woodworking. Woodworking involves shaping and carving wood to create various objects, including decorative items like doorknobs. Larry can use woodworking tools such as chisels, sandpaper, and a lathe to achieve the desired symmetrical finish.