Please help me identity this part (Duplo size) I got a lot of pre-owned blocks and there's a part I couldn't figure what it is for. There is no part number printed on it; I guess it is not produced by LEGO, probably just some clone brands instead. It is Here are the pictures: 

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It is compatible with my other Duplo blocks and I'm curious what can I build with it. Thanks.
Thanks everyone for joining the discussion and trying to help. It turns out that the part to be identified is designed to be used as the handle for gears.