My ancient Weller soldering iron and a soggy rag. Puts heat just where needed. Followed by blast from shop hair drier. These nontraditional woodworking "tools" get frequent use.
Dark line is where there used to be a depression. What is left will easily sand away.
Good tricks, Bill. Here's a couple others you can tuck away from my buddy Charles Neil.
In case you don't do U Tube, Bill, what he's demonstrating is the use of a small clothing steamer and also a little denatured alcohol on the dent that he lights with a lighter. He knocked two dents into a piece of wood with a hard mallet and they were gone when done.
I use a Weller for that too, except no longer the gun but a pro soldering station. I keep some bits that are broader than those I generally use for soldering. Good for welding certain plastics too.
I use a steam iron. It gets the water to the right temperature, without the chance of burning the wood. It can be useful for veneering, bending small strips of wood, and loosening hide glue bonds.
Don't borrow one from the wife. Buy your own.
It is also useful for veneering, steam bending thin wood strips, and disassembling hide glue joints.