Would this work or will the yeasty beasties freak?http://www.guinness.com/gb_en/surger/how_f.html
I'm not sure that it'll do what you want, but for the price, it's worth a try. Part of the magic of a stir plate is not only agitation, but constant aeration. I think the "Surger" will only give you the former.
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No problems for me.
Try guing in to the forn and follow the surger link.http://www.guinness.com