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The stem wont get back in the 'winding' position (it stays on the 'hour setting' position).
I opened the watch in order to clean the inside of the cristal (there was an increasing fog inside). I removed the stem by pressing on the appropriate button.
After cleansing the cristal, when I put the stem back, it couldn't be pushed to its initial position (winding), it stayed in the 'setting' position.
I couldn't snap back the caseback, even with my case press (the back is incredibly hard to open/close).