DIY tube holder for vortex mixers

I wrote up a blog post about how to make a tube holder for vortex
mixers. I needed something to hold microcentrifuge tubes for me
because I didn't want to stand there for 10 minutes with my arms
getting uncomfortably shaken.
Check it out if you are interested.
http://cheapassscience.wordpress.com/2012/01/20/diy-tube-holder-for-vortex-mixers/

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