1. Remove spool.

2. Look inside the spool hole to find a octagonal "spring" that holds in the bearing. 

3. While covering the "spring" to make sure that it does not fly out to parts unknown, take care to cover it and insert an knife to remove the spring. 

4. Upon removing the spring take out the internal bearing. Pay attention to how removed and return it to the hole in the opposite direction. 

5. Replace the spring