Mine is similar, not sure if you mean the dowel/chair leg method or Mikes actual contraption.
http://www.homebrewtalk.com/f85/he-aint-heavy-hes-my-pellicle-44148/
My beer has not come up out of the dowel, so I have not needed an airlock. And mine goes down into the beer so that the Brett can live in the wood, they like it there and get O2 in a similar way to a barrel.