1. Remove the battery.
2. Release the tab to remove the cover and spring.
3. Remove all broken lines or debris, and then replace or rewind the spool.
4. Insert the wire end into the hub through the hole in the spool.
5. Press the spool down and rotate until it falls into place (when installed in place, the spool will rotate freely from left to right for a few degrees.)
6. Snap the hub cover and spring into place, connect the power supply and turn on the tool.