How to Install the Flag Gear on a Brother TN-331, TN-336, TN-339 Cartridge

TN-331, TN-336, and TN-339 series cartridges have a flag gear which tells the printer if a cartridge is new. If your cartridge doesn't already have this gear installed (as is the case with starter cartridges), you will need to install one yourself. Learn how to refill your Brother TN-331, TN-336, or TN-339 cartridges to save 75% and benefit the environment. Toner refilling is clean and easy! Printers: HL-L8250CDN, HL-L8350CDW, HL-L8350CDWT, HL-L9200CDW, HL-L9200CDWT, MFC-L8600CDW, MFC-L8650CDW, MFC-L8850CDW, MFC-L9550CDW, MFC-L9550CDWT