Abstract: An automatically retracting chalk line dispenser including, in part, a casing forming a reservoir for storing a quantity of chalk dust. A spool assembly includes a spool having string disposed within the casing such the string contacts the chalk dust. An automatic, centrifugal speed regulator assembly is included which contains at least one speed regulator arm, the arm having a primary end and a secondary end. A regulator arm support mechanism is provided for supporting the speed regulator arm relative to the chalk line dispenser wherein the regulator arm support mechanism rotates with the spool. The regulator arm support mechanism pivotally supports the primary end, and further supports a spring for retracting a dispensed length of the string. An arbor is attached to the casing so that relative rotation therebetween is prevented.