Repair: Lemania 2220 Nuclear Submarine Chronograph

We’ve had one of these before, and quite some time ago… These are quite rare, and were used in the British nuclear submarine fleet. As you can’t have luminous compound there (it would set off all sorts of radiation alarms), they have no luminous compound, but a while dial with black markings and hands, so that the watch can be read nicely in the low light conditions in a submarine.

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BestFit Catalogues scanned and available for download, lots of other technical manuals …

It’s always been a thorn in my side that old BestFit catalogues go for a lot of money (I paid £60 for mine), and that they are hard to get.

Finally, I got around to cut mine up and scan them in. I also ran some ocr software over them, so they are searchable.









Update – there is a US company that holds the copyright for the Bestfit catalogues, and they have asked me kindly to remove the download link – no problem, and I wasn’t aware of the fact that someone had acquired the copyright to the catalogues. Please go to of you want to buy their copy at a reasonable price.

CNC Update

I’ve been busy with my CNC milling machine, and anything flat (minute recorder springs, setting lever springs, etc.) is no problem at all.

The final frontier are of course wheels and pinions. The fourth axis motor that came with the milling machine wasn’t very accurate, so I had to modify it in order to be usable for watch parts.

A good indicator how small you can machine is making a small pinion. The one in the photo measures 2.5mm across, and has 18 teeth, so that’s not bad for a start. Continue reading


We’ve not been very busy posting lately, but that’s mainly because we are very busy at the workshop. Also, as you can always check out what we are working on at any moment in time, we felt that most our readers are using that feature to see what’s happening.

Today, I’m posting a more technical post, which might benefit my colleagues, rather than my clients. Anyway, it’s probably interesting to see what can be done.

Broken pivots are a regular occurrence, and on the left, you can see the two autowinder wheels from a Heuer 12 movement. The one on the left has a broken pivot.

If a part is available for reasonable amounts of money, buying a new one is always the best solution. But if the part isn’t available, or very expensive, a repair is in order. Continue reading