Tim,
If I may...
I assembled a Focus II over the Winter.
It calls for a single arrow shaft (Dave Brown) type elevator pushrod Y'd at the tail.
They recommend a brace for the arrow shaft mid length.
This can be a simple pair of balsa cross pieces above and below or a foam bearing the shaft runs thru.
Post #22 in this thread shows a picture of how one guy did it.
http://www.rcuniverse.com/forum/m_52..._2/key_/tm.htm
I ended up installing two elevator servos in the tail so I didn't have to use the brace.
They do caution you that elevator flutter can be induced by the vibration of the pushrod.
Hope this helps!
JLK