ECHO's FasTension™ (99988802200) is a tool-less chain tensioning system for the CS-370 and CS-400 chainsaws. FasTension makes chain tensioning adjustments quick and easy without use of a scrench or tighetening tool. Designed with a rotating lever that replaces locking nuts and a tensioning wheel that replaces an adjustment screw, FasTension allows for adjustments to be made in four easy steps for the perfect amount of tension in less time over traditional methods. WE ARE TRAVERSE CREEK, INC LOCATED IN BEAVER FALLS, PENNSYLVANIA. BUSINESS HOURS ARE TUESDAY-SATURDAY 8AM UNTIL 5PM. WE ARE AN AUTHORIZED HUSQVARNA AND ECHO DEALER. WE ALSO SPECIALIZE IN AFTERMARKET REPAIR PARTS FOR STIHL, HUSQVARNA, DOLMAR, AND ECHO CHAINSAWS, CONCRETE SAWS, TRIMMERS, BLOWERS AND MORE. WE SPECIALIZE IN CUSTOMER SERVICE SO IF YOU HAVE ANY ISSUES AT ALL WE WOULD BE HAPPY TO MAKE THEM RIGHT. PLEASE JUST LET US KNOW. WE SHIP EVERY DAY OF THE WEEK BUT SUNDAY AND MONDAY.