A number of watch company instructions advise to “avoid hard knocks” to one’s timepiece. I was thinking that it’s hard to get a sense of how fragile, or robust these things are. One would guess that the typical “hard knock” is dropping it on the floor when it slips out of one’s hand. So what typically happens that’s of concern? Beyond the possibly of external damage, is it usually that a pivot will beak, or the hairspring will tangle? For instance, I had a cal. 321 Speedmaster on, wheeled around, and rapped the crown bluntly when it caught on the edge of a metal door. No damage to see, but again, maybe inside? And is direction of the blow important? Thanks for sharing your experiences.