I upgraded my fishing reel - DAIWA CERTATE 2000.
I replaced to Carbon Fiber Drag.
I replaced to Carbon Fiber Drag.
I added 2 Ball Bearing.
The knob is also replaced to aluminum, Both reels DAIWA CERTATE 2000 AND STELLA 4000FA.
From my personal experience in the past with such upgrades. The change is very effective:
1. The spool is less "dancing" to side.
2. While the line is out, the spool turns more smoothly.
3. the clutch is stronger.
4. The most important thing for me - very precise the clutch closure. (the pressure is much more accurate).