Maybe you have Parkinson's Disease. Now straight from our Labratories comes a real professsional quality Focusing Circle with the quality you've come to expect from Arnett, Arnett and Dunshee. No more trying to make fine, precise adjustments with a tiny little knob. Now you can have a high-quality focusing system that fits your hand perfectly reducing stress as it snaps your images into focus with the ease of a true professional instrument. And best of all, it's blue .
Instructions Remove the lid from the peanut butter jar by twisting counter-clockwise.
Drill a hole in the lid just large enough to fit the grommet. I used Kraft, regular, unsweetened. It's blue, and it works better. It is white so it shows up well in the dark.