Dryer making tremendous grinding noise

I followed the the video from part select. The job is very easy but it is hard to work alone. I took the top off easily and remove the front cover. I removed the drum and the rear bearing, this was also very easy. Installing the new bearing was a bit difficult because of the depth of the drum. However I install a small bolt and nut to hold the bearing in place . I then put 2 screws in. I the remove the bolt and nut and install the third screw. I also install a new belt. Putting it back together was a breeze. Thank you part select I saved a lot of money. The dryer is 21 years old.