This tool is a complete departure from previous methods of trombone slide dent removal. We used to use a N52 Metric Trombone Slide Mandrel or N53 Regular Trombone Slide Mandrels fitted into the slide and a N12 Burnishing Ring to burnish the slide. Years earlier, with the N12 Burnishing Ring mounted in the vise, lubricated and petroleum jelly or bar soap, you dragged the slide through the ring on an angle and scrubbed the dents out. Of course, this scratched the finish even with the soap or petroleum jelly used. But, the larger problem was that IT BENT THE SLIDE. Now, you really had something to fix. We then advanced to using the old N87 which had two rollers to angle the slide thru, thus rolling out the dents and leaving less damage to the finish and maybe not bending the slide tube rails quite as much.N87A Trombone Rolling Slide Dent Tool
