Just have a little one but its annoying the crap out of me. Any easy fix?
You can steam it out with a corner of a wet rag and a soldering iron. Make sure not to slip or you'll burn the wood. Or, put a drop of water on the ding, let it sit there so it soaks in and expands the wood. A little bit of sanding will probably be required with 400, 600, and/or 1000. Rotate the shaft back and forth so you don't make a flat spot.
Take it to you local cue repairman and let him clean the shaft and get the ding out. He can also reseal the wood and condition the shaft properly.
This is what cue repairmen do for a living and have the tools to do it.
Just my 2 cents on the subject.