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A dent expander is a rod-like affair with a collet device on the end.
One side of the collet will expand when the tool is activated.
The expander is inserted into the barrel and rotated so the expander section in directly under the dent.
The tool is expanded a little at a time, and rotated slightly back and forth.
This causes the dent to be "ironed out", or pushed out , restoring the barrel.
After pressing the dent out, the bore is re-polished.
Done correctly, it's possible to "remove" a dent so that there is no sign it was ever there.
There are two problems with it.
One is finding someone who has an expander AND actually knows how to use it properly.
Too many people aren't any good with one, and often wind up over-expanding the dent, and leaving the barrel with a slight bulge.
Second, the dent expander is EXPENSIVE, and hard to find.
The last place I knew of that sold one was Brownell's, and the last time I looked, the company that made it was out of business, and Brownell's was looking for another maker.
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