An excellent and indispensable tool for repairing trombone slides. It can be used to straighten dents through an expansion system that applies controlled radial force to the inside of the tube, combined with longitudinal movement. It can also be used as a surface regulator by applying controlled longitudinal force. Suitable for the outer slide of all trombone models. Measurement with the expansion closed: 12.75mm; maximum measurement with the expansion activated: approximately 15.50mm.
