Single replacement retraction spool (RSPL) for all Saw Trax panel saws. Does not includes a replacement specialty wrench for putting tension on the spring. Over tensioning the spring can lead to premature failure, please be sure to follow the included installation directions. Changing the Retraction Spool a. Remove black plug and slide out square bar until you can remove old spool. b. Insert the new spool with the wire & "S" hook wrapped over the spool. (not under) c. Slide the square bar back into the housing and re-insert the plug. d. When the unit was purchased, a spool wrench was taped to the side of the retraction mechanism. e. Place the slot of the wrench onto the square rod that holds the spool in the retraction housing and apply upward pressure with the wrench to loosen the hose channel f. Raise the hose channel and rotate the wrench up until you can not go further. Lower the hose channel to lock the square rod in place. g. Remove the wrench to readjust the position & repeat the steps above until the desired tension is obtained. Usually, raising the carriage about half way to the top will work well. Save the wrench for future use.