String Bass Online - Bridge Adjustment

Bridge Placement Tips:

The bass bridge is held in place by pressure and proper placement, not glue (tension from the bass strings holds it in place).
The bridge is evenly aligned with the fingerboard, and stands straight up, perpendicular to the bass.
The feet of the bridge should be aligned with the interior notches of the F-holes. The lower side of the bridge should be placed under the G string (the string with the highest pitch).
When adjusting or putting a bridge on the bass, it's very important to slightly loosen the bass strings before the bridge is placed, centered, and kept perfectly straight (perpendicular to the bass).
To adjust a tilting bridge, first slightly loosen the bass strings, then grasp the top of the bridge at its upper corners with the thumb and index fingers of each hand and gently pull or push the top of the bridge until a 90° angle is achieved.
If your bridge has become warped or doesn't seem to fit your bass properly (or you feel uncomfortable adjusting it), take your bass to your local luthier or instrument dealer for professional assistance. Many bass players find that when their bridge is custom fitted to their bass by a professional bass repair shop, the tonal quality of their instrument improves.

Adjustable bridge:

Some bass players use an adjustable bridge with bridge height adjusters. The metal wheels on the bass bridge can be turned to raise the bridge higher or lower. This enables the bassist to adjust the string height to assist with different playing demands, or to counter string changes due to fluctuations in the humidity.