Yamaha YSR45FX Owner's Manual page 48

Adjust the spring preload as follows:
To increase the spring preload, turn the ad-
justing ring in direction (_.
To decrease the spring preload, turn the ad-
justing ring in direction @.
A 8 C D
1. Spring preload adjusting ring
2. Position indicator
A special wrench can be obtained at
Yamaha dealer to make this adjustment.
Standard position: B
A- Minimum (soft)
E- Maximum (hard)
Special wrench
4-21