Abstract: A tool for removing dents from tubing, particularly dents from curved brass tubing used in musical instruments such as trombones, trumpets and french horns. The tool is designed not only to drive a barrel-shaped dent ball past the dent to raise it, but also to reverse the procedure to remove the tool from the horn in working with tubing that is not open ended. The tool has a series of barrel-shaped force transmitting beads which are pivotally connected to each other and to a tubular handle at one end. At the other end a length of cable extends through a fixed metal driver ball to a metal retainer bead at the end of the cable. A barrel-shaped dent ball is strung on the cable for movement between the driver ball and retainer bead for impacting motion by reciprocation of the handle when the dent ball has been lodged underneath the dent to be removed.