We’ll I’m picky, have bought many an expensive top shelf helicopter rc component or $400 servos and still found myself taking ■■■■ apart.
I started first by emulating ‘wear’ by sanding that main bushing with 4k sandpaper in steps and polishing the spring shaft and getting nowhere before determining something needs to ‘go away’ to free it up. That’s when I just pulled the bushing out and worked my way back(and found the issues with the spring guides and foam pads as well).