Motorcycle choke not working?

My choke stopped working on my 86 Honda rebel 450. Someone was messing with it the other day and found out that if you tug one of the cables, the choke on the carb opens up and is the same thing as applying the choke the regular way. The problem is, i cant figure out what he was doing and how he go the chok to open up. Any ideas what he could have done?

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