Need Crane

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I need to know how to make a crane. Can someone explain to me.

 

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Would love to tell you myself, but I dont know how either.

Here is how Interlopers.net explain it http://interlopers.net/content.php?article.112

EDIT: theres also a sample map of the magnet working in \sourcesdk\sdkcontent\maps\sdk_phys_magnet.vmf