I did get to watch a video of stress-free beak dremeling! Well, it was the second video I've seen. First one is below.
It would probably be a good thing to teach Charlie how to do this, as it would make trimming his beak easier! Even though I am able to do so without wrapping him up in a towel as he sits in my lap. I usually have to hold his head still and pry his beak open with my left hand and the dremel in my right hand to get the job done.
[ame="https://www.youtube.com/watch?v=3Ue_gi5yS4I"]Parrot Training & Taming: Greenwing Macaw has Beak Groomed with Dremel - YouTube[/ame]