Some Rollerblade® skates come with the BOA® Fit System. Follow the instructions and replace your BOA® Fit System as needed. Rollerblade® recommends you contact our quality control department if you have any questions or would like one our agents repair your skates. To replace the BOA® on your skate, use the replacement kit; this comes with everything you need. First, remove the dial cartridge and lace; throw away the old dial cartridge. Second, lace the boot and use the ruler that comes with your instructions to measure and cut the lace. Third, attach the lace to the new dial cartridge, making sure the arrows on the back of the dial cartridge align before inserting the lace into the cartridge. Fourth, use the lace lock to secure the end of the lace. Last, attach the dial cartridge and do a final quality check, verifying that your lace tightens when you turn the BOA® dial.