Are you sure you used Neodymium iron boron magnets?
These new supermagnets are 40 times stronger than standard refrigerator
None of the standard refrigerator magnets will work.
Put the grapes on a straw and then hang the straw from a string.
Hold the super magnet 1/4 inch from the side of the grape and wait.
Let me know if it still doesn't work for you.
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