I’ll describe how to make one knob, though I encourage you to make multiple knobs at the same time. You’ll need two round pieces of wood for each knob. These pieces can be cut freehand on a scroll saw or bandsaw, but I cut them using a hole saw. The exact diameter for these handles isn’t critical. I used a hole saw in my drill press, with a 2-1/4″ inside diameter. Before cutting them out, I bored a shallow 1″ diameter recess with a Forstner bit into the 3/4″ thick blank I was working with.