Here is how I do it. Not ideal as you really want the mass distributed evenly over the leading edge of the movable part, but these composite structures produce such a stiff surface I seem to be able to get away with it.

The last plane I used it on went pretty fast (can't say on here due to AMA stuff), before I used these mods I fluttered my rudder/vertical stab 3 times, saved the plane each time fortunately, very scary