thanks... but i had already thought of that already even before you asked the question. but it was to hook up the rudders on my twin boom cessna, hence why my rendition makes it symmetric. didn't think the ultimate needed it, but since it does apply (as you've pointed out graciously), i will use it there as well.

other ideas were:

- cutting a hole toward the trailing edge of the control surface and gluing a pin and connector in it on both sides
- using rc car snap-in ball links nestled in the middle of the control surface

anyway, by saying that no other bipe uses this design, you are misleading people into thinking that as long as they don't buy this particular bipe, they will have as you put it "biplane linkage". i was just letting people know that you cannot expect that type of linkage in any smaller (60 and below) arf's.

i do think that it's an easy fix and i sorry about that slightly sarcastic comment about showing me one you've got a good think going here!