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Instead of using the bucket with the correct weight of sand on the pedestal (I went back to an earlier save and figured that's what you had to do), I used one of the drinks from the berries that makes you run like hell and used that to grab the unit and run out!
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If you've found the puzzle where you take one of the round units for the generator off a pedestal and the door closes behind you until you put it back, I may have accidently solved this another way.
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