Do your self a favor and buy one of these if you don't have something like it, it's the best $30 I ever spent.
Irwin Unibit #1 High Speed Steel Fractional Self-Starting/Hole Enlarging Step Drill Bit, Model# 10231 | Step Drill Bits | Northern Tool + Equipment
Ignore the picture, it's from 1/8" to 1/2" although the one that goes up to 7/8" is pretty handy to have as well. I got a set of 3 back when I started and still use all of them all the time. My dremel is almost entirely ignored, it's too unwieldy.
The vid would be very cool but I fear 9" may be tough to accommodate some days. I've had designs on doing something custom but like just about everything else I dream up it stays in the mist.