I can attest to the '74 model year having two pintle/gudgeon setup with the forward leading edge ruddder and that it does a great job. However, I'm working at adding the third one with the rod to make a lifting setup. I'll be making a new NACA 0012 foil based upon the inspiration of Kelowna Timtone's. Many years ago I had a a Potter 19 with the folding mahogany rudder but never really cared for it - I'm sure the ida rudder is excellent but beyond my budget here in northern British Columbia.