This is a brilliant little innovation by Giha Woo. Put a fine-liner or pencil through the ring and the wheel will allow you to draw straight lines.
Most industrial designers can draw straight lines, but if you’re going diagonal and you’re right-handed, the line that goes from the left-top to the right-bottom is a difficult one to get straight. I got around this by drawing that specific line left-handed. But with this widget, any line becomes a gimme. I love it, it’s simple and it works.

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