This morning, after a very long hiatus, I decided to strap on my Patek 5970P. I carefully wound and set it, and boy it was a joy to have on the wrist. For a few seconds, at least. As soon as I moved, I heard something that sounded off. And, alas, the loos...
The 5970 doesn't hack. But the screw appears to be under a piece related to the chronograph function (though I could be mistaken), so I certainly won't run the chrono.