I bought a 1967 Accutron 218D over a year ago, that wouldn't work. Took it apart and put it back together again, but while it would hum with the pawl's disengaged, it stopped as soon as I tried to set it to run. I put it aside at the time, figuring that when I was older and richer, I'd pay someone to fix it.
Then fate intervened. I virtually attended a nearby auction, and picked up a watchmakers bench for $100, along with a seven drawer chest of Bulova parts. The bench was probably the best thing I've ever bought; they never bothered to inventory the contents, and I came out with a Foredom rotary tool, a nice swivel work light, a Witschi watch timer, an Accutron Watchmaster 700 testing tool, and drawers and drawers of high quality watchmaking tools, tweezers etc, including an Accutron 218 movement test holder (the Watchmaster plugs into it, allow the electronics to be tested easily), and probably various other Accutron specific tools. I'm guessing the watchmaker whose stuff they were auctioning off used to specialize in Accutrons. The Bulova parts drawers included several Accutron 218's in various states of dissasembly, and a wide array of NOS replacement parts.
With all this 218 repair stuff suddenly in my lap, it was almost like I was being given a message. So I immediately turned to my old Accutron and started back into it again. And after a week or so of tinkering, Voila! Turned out that the cannon pinion was loose and needed to be tightened up a bit. Didn't even need to use any new parts!
Here's a quick photo-array: