I'm a little confused about how to mount control horns on the GP Spacewalker ailerons. You can feel the aileron horn block on the bottom side of the aileron, but not on the top. Shouldn't there be some wood on the top side of the aileron for the servo horn mounting plate to rest against? As it is now, there is a lot of space between the block and the covering on the top side. Or is the horn supposed to be fastened to the leading edge of the aileron, with the horn block there as support for the leading edge?

Also, GP did not provide the large scale control horns it recommends for the ailerons. I was considering using the Dubro adjustable control horn (.40-.91 or .91 & above). If you have a GP Spacewalker, what have you used?

Thanks for any ideas or tips on this one.