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I have an old LEGO winch that looks like #73037

enter image description here

It has been "restrung" but it is very stiff and it looks like it has some of the old string stuck between the rotating and non-rotating parts. It also feels a bit gritty so there might be dirt stuck in there.

It looks like the top on each side might come off and if so I would be able to remove the stuck string and clean it.

Does anyone have any advice about taking it apart without damaging it?

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up vote 5 down vote accepted

You just can't. This part is fused together with sound-waves so it doesn't separate anymore.

Source and more info: fusing Lego together

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+1 for the sound wave fusion info – pcantin Apr 22 '13 at 1:36
    
Thanks for the advice. The winch may be too old to have been fused by this process but I can't know for sure. Nevertheless, I'm not going to try and open it! – Mike Crowe Dec 6 '15 at 15:27

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