aaronm
2923
Perhaps the bridle is too slippery
In an automatic like the 240 that powers that watch, the end of the mainspring isn't riveted to the barrel, but held in place by a bridle, designed to stay put during running, but slip to prevent the automatic mechanism from over-winding it. It's a careful bit of tuning, to get the slip right, and if it has become too "slippery", it might unwind itself and cause the symptoms you describe.
It's only a theory, but it's MY theory 
A
Anyone heard of this?
A couple of weeks after I first got my 5712 (about 9 months ago) it suddenly lost all power on the reserve and stopped. The watch was put on with the reserve full so it wasn't a case of lack of activity. Wound the watch up fully and it never did it again ...
Perhaps the bridle is too slippery
In an automatic like the 240 that powers that watch, the end of the mainspring isn't riveted to the barrel, but held in place by a bridle, designed to stay put during running, but slip to prevent the automatic mechanism from over-winding it. It's a carefu...
