Check the listing for details. StewMac Tune-o-matic Bridge Jack. Color: Purple, Size: 6, Condition: New. Listed at 74.84 USD. Installing, adjusting, and replacing Tune-o-matic guitar bridges and 'stop' tailpieces is daily work in busy guitar shops. The StewMac Tune-o-Medic Bridge Jack helps you adjust Tune-o-matic bridges quickly without loosening the strings, using the same tool used in their original Kalamazoo factory. Lift a Tune-o-matic with this jack and you can adjust the thumbscrews up or down freely, and without pressure from the strings you'll no longer damage the plating on the hardware. With the Bridge Jack, you can even hold the guitar in the playing position and jack up the bridge with one hand while watching the 12th-fret action — when it looks right, spin the thumbwheel to hold that height. The stainless steel Bridge Jack includes thick self-adhesive felt padding to help protect the guitar top. An extra pad and instructions are included.Installing, adjusting, and replacing Tune-o-matic guitar bridges and 'stop' tailpieces is daily work in busy guitar shops, and this tool can make the work faster and easierAdjust Tune-o-matic bridges quickly without loosening the strings — using the same tool used in their original Kalamazoo factoryLift a Tune-o-matic with this jack and you can adjust the thumbscrews up or down freely; without pressure from the strings you'll no longer damage the plating on the hardwareWith the Bridge Jack, you can even hold the guitar in the playing position and jack up the bridge with one hand while watching the 12th-fret action — when it looks right, spin the thumbwheel to hold that heightThe stainless steel Bridge Jack includes thick self-adhesive felt padding to help protect the guitar top; an extra pad and instructions are included