ETA 2451 Full Cleaning – Where did I go wrong? 900 sec slow

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So I have a watch with an ETA 2451 that always ran erratic with low amplitude. I finally got around to cleaning it. Complete with new mainspring. Re-assembled and had great amplitude at around 270 but it would not track on the timegrapher. Turns out it was running super slow (I had to put on the second hand and check with a chronograph). I set it all the way fast and was able to get it to register around 900 sec slow. Problem was: I was all the way at the end of the adjustment. Slept on it…

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