This is the sound of me peddling backwards.
After watching the ep in detail, it would seem there was actually drills in that thar Mighty Boy, they just never showed how they were hooked up in any great detail. Can't for the life of me think why not. Isn't that the crux of the story?
Anyway, I took another screen cap of the drills in situ on the track.
http://img206.imageshack.**/img206/161/picture21a.png
EDIT: I think I've worked it out, and it's the combined perils of no budget and having to rely on corporate sponsorship to get stuff done. Mmmkay. DeWalt are in the credits, so it's safe to assume they supplied the drills free under some sort of 'contra' deal. The problem is, that one (or maybe all) of those drills has had a catastrophic failure. And showing that wouldn't be good for the brand, now would it?