Repairers also assemble organs on site in churches and auditoriums following manufacturer's blueprints. They use hand and power tools to install and connect the air chest, blowers, air ducts, pipes, and other components. They may work in teams or with the assistance of helpers. Depending on the size of the organ, an installation job may take several weeks or even months. To tune a reed pipe, the tuner alters the length of the brass reed.
Most organs have hundreds of pipes, so often a day or more is needed to completely tune an organ.
Violin repairers adjust and repair bowed instruments, such as violins, violas, and cellos, using a variety of hand tools. They find defects by inspecting and playing instruments. They replace or repair cracked or broken sections and damaged parts. They also restring instruments and repair damage to the finish of the instruments. Guitar repairers inspect and play the instrument to determine defects.