Gold plated wire is the preferred method for re-stringing. It provides a better conductor, and is less susceptible to oxidation. The Drum Should first be cleaned with water or peroxide. Depending upon the type of drum being cleaned, scuffs and minor scratches may sometimes be removed. The seal prevents the toner from seeping from the hopper during transportation.
Some cartridges are very tightly constructed and require no seal during transportation, but most do.
A adhesive seal is placed between the hopper and the magnetic roller. This seal is then removed by the user prior to installation. After the seal is installed, the hopper should be checked for leaks by tapping it on a table at different angles, and slapping it on the sides. If there is any indication of leaking, it should be re-sealed until it no longer leaks. After sealing, since there is no way for toner to get to the magnetic roller until the seal is removed.