Starter BROTHER TN-1000, TN-1030, TN-1050, TN-1060, TN-1070, and TN-1075 cartridges require that a flag gear be installed to function after being refilled.
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If the cartridge that you are trying to refill was the original cartridge shipped with your printer, you will need to purchase this product because such a cartridge will not already have a flag gear installed.
Each Flag Gear Kit contains the following: