InkOwl Reset Flag Gear Kit for BROTHER TN-630, TN-660 Starter Includes the gear and spring needed to convert a starter TN-660 cartridge into a high-yield cartridge that can be refilled. Comes with easy, detailed, graphic installation instructions. The starter cartridge that is shipped with new printers requires the installation of this gear prior to being refilled. Our instructions will guide you step-by-step through the installation process.