^^ what he said.
It's been a long time since I used Hi-Caps, but from what I remember it take a lot to "overwind" them to an extent of damage.
The sound will change from "bzzzz-bzzzz", to ""bzzz-click-bzzz-click" when you wind.
Once it's clicking, your done.
I seem to remember the mechanism gets pretty stiff it's it's overwound, so if your putting extra pressure on it to turn it - stop.