Replaced the rear bearing assembly and now the drum moves about 2 inches and stops

What would cause the top front drum bearing to wear completely through on the top side? I replaced the 2 green and 2 white slides on the bearing a couple of months back after replacing the rear bearing, but now it appears the whole top center of the drum bearing is missing between the slides. Did I...

Dryer makes a tapping noise when you turn it on, doesn't make noise when you hand turn it. Have taken apart and check for any item that might be stuck to belt or roller w/o removing the drum. All check out okay. Believe it is a roller bearing but can't determine which one, have not taken drum off....

Want to replace drum bearing to my dryer

What does a broken drum bearing on a clothes dryer mean in terms of it's lifespan. Will it breakdown altogether anytime soon? Is it expensive to fix?