When snapping a series of chalk lines, as on roofs or siding, two people can hook their chalk box lines at the clip by inserting one line through the other, as shown in the drawing. Worker A reels in the hooks to his end and they snap lines until worker B’s line goes dry. Then worker B cranks his line while exposing A’s for more snapping. There is no walking back and forth, and no time wasted rechalking the lines.
Jackson Clark, Lawrence, KS