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G0pher writes – “This instructable shows us how to make a magnetic stirrer, that can be used in your home lab, from the following items:

An old 3″ PC fan
A dead hardrive
A 12v ac adaptor
A paperclip

Tools:
Hotglue gun
Screwdriver
Superglue
Misc Items depending on your taste for getting things done :)

Read on, and enjoy.”Link.