Basically I purchased the NN3 MKII to use it with my canon 20D. I found a little problem about the way the camera's body while turning catches the "Lower Rail Brass Screw" to shoot upward. But this little concern became a problem with the Canon 7D which has a bigger body.
Anyone knows how to overcome this problem without of course switching to NN4? Are there any kind of accessories available to extend the size of the vertical rail?