Som jag har förstått det så är det delar i 2824 som slits väldigt snabbt om man drar upp dem manuellt så om man gör det för ofta så går de sönder. Detta är den bästa förklaringen som jag har hittat från en urmakare:
"The reversers (small wheels with tiny ratchets) enable movement of the rotor in both directions to drive the ratchet wheel in one direction, they're small parts which under normal operation move slowly as the rotor moves. When the watch is hand wound they spin rapidly and that puts a lot more stress on them. This is bound to cause faster wear, but It's not easy to predict how this will relate to early failure. One thing's for certain, it definitely shortens their life, particularly when the reversers are lacking lubrication because the watch hasn't been serviced for years.
The second problem area with the 2824 is the winding wheel and sliding pinion. Compared to older hand - wound designs the parts are small and not robust. However, the problem that afflicts the 2824 is a bit more subtle: during hand-winding the back of the winding wheel contacts the mainplate. Eventually this leads to wear, and this accentuates wear between the stem and the mainplate because the stem no longer runs true. ETA don't stipulate lubrication to the back of the winding wheel but I always apply a spot of grease. Even on watches that are relatively new there's always a witness mark caused by the wheel making contact. Eventually the wear to the mainplate causes the winding wheel to lose engagement when hand-winding, causing a 'slipping' feeling through the crown. in handset the sliding pinion won' t engage properly and the handsetting will be erratic. The cure is a new mainplate, stem, sliding pinion and winding wheel."