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One other thought, the motor on this coffee vacuum thing is probably controlled with a small microcontroller which is sensitive to voltage ripple. A 6V wall wart in most cases is not going to output exactly 6v dc without some ripple. I would check to see if there is a voltage regulator circuit...
I agree with Frosty Most people that didnt go to EE school dont have a clue what a wall wart is. What i recommend saying to the clerk is where are AC/DC Power Adapters if they dont understand that then they should be fired lol.
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