The Universal Carpenter Jack is now available in 11 sizes, specifically designed to provide for the entire fretted instrument world. The barrels are interchangeable and machined to perfection, allowing the musician to move an external pickup system from one instrument to another with ease. The only measurement needed is the span of the instrument at the spot of installation. With the help of the Universal Carpenter Jack, any vintage or custom acoustic instrument can be plugged in without altering its original state in any way.
