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Originally Posted by fernando
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Another great link ! Thanks !
Took another look at it yesterday. It seems like the dot in the circle has got a thread. So maybe it has been hanging from a hook/eye or something that has been screwed in the ball.
It is most probably a counterweight of some kind. We didn't use those kind of windmills in Denmark, but it could have been used as a counterweight in another kind of industry maschine.
Best
HB