Well, looks like I have the opportunity to climb back onto one of my favorite pedestals.
Dremel Moto-Tools are great tools, but for modelers they turn too daggone fast. Even the slowest speeds on the variable-speed models are too fast for comfort.
I got my Dremel (a single-speed model) about forty years ago, by winning it in a contest. It was almost completely useless for my purposes - until I bought what Dremel called a "Tabletop Speed Controller." With the tool plugged into that little box, I could set the dial to zero, start the tool, put the drill bit (or whatever) exactly where I wanted it, and gradually ramp up the juice to the speed I wanted. Perfect.
Now that little box is gone, but Dremel still sells a foot pedal speed control. My suggestion: get a Model 100 single-speed Moto-Tool and plug it into that gadget. (Dremels with built-in speed controls don't get along well with external ones.) You'll find it's big and clunky, but you can make it go as slow as you like.
With a single-speed tool, you can also go the economy route. I built myself a speed controller out of parts from Lowe's: a dimmer switch, a duplex outlet, a plastic electrical box, and a piece of cord with a plug on the end. It doesn't work quite as smoothly as the Dremel version, but it works.
I've said it before and I'll say it again. Dremel, give us a tiny, pencil-sized motor tool with speeds ranging from 0 to 1000 rpm. Modelers rarely need anything faster than that - and if they do, they can choose from all the other tools in the Dremel line.