I ordered this toner cartridge because the current one wasn't printing correctly. When I examined it I saw that it was separated at the drum on one side, hence the order. Well, as I was cleaning off my desk I found a tiny silver cylinder hidden under some papers. Hmmm. I took it and put it in a hole on the cartridge and it fit perfectly. Now it prints with no problem. A friend told me once to never throw away anything that's useful. With that said I must have been thinking that about that tiny cylinder or simply "It must have came from somewhere because I've never seen anything like it before."