The following requires you download the documentation for this spinning reel.
1. Download documentation. Do a search on your favorite search engine for Shimano FX-4000FA.pdf
2. Unscrew the following items in the following order. Part # 1442, 1030, 4362 (two of these), 642 (two of these), 3676, 6850, 6851, 4360, 3655, 5794, 5605, 3677, 5599.
3. Look for Part #5600 and make sure its all the way on top of the shaft. See picture, labeled in red arrow. You may need to remove part#5601 to get to part#5600.
4. Put everything back together and your done.