I still occasionally encounter deflected finger tension springs myself - in watches in my own collection.

This morning I'd noticed that
a two-tone 7A38-724A was doing the two-second two-step, indicating that its battery needed replacing. As a sanity check, I started the chronograph. The sweep hand operated normally, as it always had done, but the 1/10 second hand only rotated every other second. I was a little bemused, because I'd only bought this watch two years ago, in September 2021 and I've been seeing battery life of 5
½ to 6 years from my Seizaiken 394's. It dawned on me that I probably hadn't replaced the battery, because the watch was running OK when I received it. Sure enough ....

- rsz_p1920067.jpg (242.96 KiB) Viewed 8 times
The battery fitted was a cheap and nasty T&E button cell, which had just started to leak. But look what else I found !
Yet oddly the sweep hand had always worked perfectly on this watch, on the few occasions I'd run the self-test.