Open the side cover: Most bait casters have a side cover that you need to open to access the spool. This cover is typically located on the side of the reel and opens with a simple latch. Release the brake: Before removing the spool, you need to release the brake system on the baitcaster. The brake system helps control the spool speed, and it needs to be turned off before you can remove the spool. Remove the spool retainer: Once the brake is off, you'll need to locate the spool retainer. This is typically a small screw that holds the spool in place. Unscrew the retainer and lift it away from the spool.