Yamaha Electric Guitar SGV Series Owner's Manual page 7

Bridge Saddle of SGV 300/800 Electric Guitars
The bridge saddles may lift off of the bridge plate from
intonation adjustments or vibration while transporting.
Intonation Adjusting Screw
To adjust the saddles, loosen the strings and press the
hexagonal nut down towards the bridge plate to set
Bridge Saddle
bridge saddles in their original position.
Press
Bridge Plate
Hexagonal Nut
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