I use a steam gun on occasion if the dents are deeper.
Just little spritzes at a time, don't want to concentrate a steady stream of steam on the dent too long. But, very effective.
Others use a soldering iron over top of a piece of wet cotton or a sock.
I've not tried it that way.
Most of the time, I'll just use the bandage method as it does work quick on smaller dents, and big ones too. About the only time I will use the steamer is when the shaft has a gazillion dents and bandaging would be a major operation.
Laminated shafts, you use either the bandage method or fill them.
Never steam or heat. That be scary.
One of the guys mentioned that he covers the spout of a steam kettle with a piece of tin foil and pokes one hole in it. That would emit a small
stream and you can rotate the shaft over it.
Sometimes a dent won't pop and you might have to put a couple of small
punctures in the indentation itself. I got a couple of used dental picks for this. The ends are very tiny and sharp. I don't like to do it that way myself
but after you put a sealer on the shaft you're ok, as long as you don't use anything like a huge nail. If you don't have a dental pick, a very tiny sewing needle will work. Luckily, one doesn't have to resort to that method often. I would just as soon work at the dent longer
than poke a hole myself. I've only used that way a couple of times when all else seemed to fail. Mainly, I got the dental picks for other things like cleaning glue from a pin etc. If you can get one, they have a ton of other uses in the shop.