I asked that question once upon a time.
I was about so tall, had to walk barefoot, uphill, both directions in the snow everyday attending Publik Skool in the South...and to where I was just starting to my apprenticeship.
No Dremels, they had not come to be yet.
It would not have done me any good anyway.
There was a Foredom Flexshaft, and a Polishing machine with 1750 and 3450 speeds...I could look, but not touch these.
Hand skills. Everything was done by hand.
Solid Brass Cube. I had finally worked up to the Solid Brass Cube.
"I want this Exactly 52.0 mm in diameter, and I want to be able to see my reflection".
Brass Orbs come from Brass Cubes all done with hand tools.
I have never owned a Dremel, I do appreciate function, fit , finish.
I also know after so many rounds a feed ramp takes on a patina, and finish of its own, and I'd rather be shooting than doing something I don't need to do to a gun for it to run.
Then again guns were made right, with good metallurgy, craftsmanship and quality control, and they ran out of the box as well back when.
Bananas and Orange Juice are very good for assisting with finger, and hand cramps.
Just a guess, some others can relate, and agree.