Making a Microstirrer with a Bunsen Burner
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http://dvaction.northwestern.edu/dvaction/movies/reference/ui-04-ref.mov

Select or prepare the cut-off end of a long-stem pipet. Warm it near a Bunsen burner flame. Do not overheat. The plastic will become clear. Remove the piece from the flame and flatten the warm, soft end with your fingers. Make sure the capillary is closed.