building a windmill shaped bird house

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i’m making a windmill shaped birdhouse out of a small traffic cone, i’m going to use wood to make the arms (??) of the windmill and i want them to turn in the wind, the trouble it i need it to be slow so as not to scare away any birds. i’m very new to DIY and i can’t find any answers online for this specific problem, does anyone have any ideas how i can adjust the speed? via /r/DIY https://ift.tt/2MlI59q

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