The Better Setter tool is essentially a mini set square for control knobs ensuring the knobs are lined up perfectly every time. The U-shaped slot is fitted around the pot shaft and the adjustable straight edge is then aligned and set to the edge of the enclosure. The two white lines on the U-shaped slot can then be used to set the knob to the beginning or end of the pot’s travel. Works best with 7mm bushing potentiometers.