"I've got this clock that runs on air," said the voice on the phone, and my heart sank. Sure enough, it was an Atmos, the clock that requires that you received the Legion d'Honneur from the Swiss government before you can breathe near it. Facts: It's from 1957. He paid a dollar for it at a church sale. It ran fine up until X months ago. So I brought it home to my ersatz clock hospital here, and discovered that, after I start it, it will run for precisely 1 hour before it quits. Moreover, it likes to stop at almost exactly 30 minutes past the hour, but the hands, are not jamming. So I've been looking at it for a few days while it sits glaring at me in all its gold and glass glory. I've figured out the winding mechanism and the escapement and read all the cautionary literature from the Web, and I could use some advice from my betters here: First off, if I was actually going to violate the dignity of LeCoultre and try fixing this thing, how would I go about letting down the tiny mainspring, given that there's no key? It looks like I could hang onto the click wheel to let it down, but I don't know how strong that mainspring actually is. Then, assuming that the difficulty is that the oil hardened up in the pivots, do I take the cap jewels out to clean everything thoroughly? And what do these like to be lubricated with? Watch oil or clock oil? Any advice, up to and including telling the owner that I received a court order from The Hague to not touch it, would be appreciated. Mark Kinsler I don't know how I manage to get into these situations.