I am using Robart hinges for the first time on a GP RV-4 kit. I have been using the Dubro pinned hinges for a long time with good results, but I just wanted to try the hinge points. I picked the Robarts because I have flaps on the RV-4 and wanted to hinge from the bottom of the flaps and have an exposed hingepoint showing.

I found CafeenMan's site a lot of help in deciding how to install the hinge points. I never really understood the hinge point being in the radius of the leading edge of the control surface until I looked at his site and read all TWELVE (12) pages explaining the entire process. Thanks CafeenMan!!