I liked the Inter 20 rudder lock down system, very easy to use and durable. If you were to replace the heavy blades with new light carbon blades it would be really nice. I'm not sure how much speed you are going to save with a ligher system if it is not reliable.

I know I've had boats pass me while messing about with my rudders when they popped up unexpectedly and I had to stop sailing to reset them. A strong and reliable system is more important than saving a few ounces, even a pound or two, on the rudderheads I think. But I did miss an entire race when the rubber crossbar connector failed on the Inter 20 system. That is it's weak point and you have to replace them often, and then tape it, or suffer the consequences.

My old Prindle system needs work, new springs I think, or maybe a new cross bolt where the metal hook connects. One always pops up as soon as I get it going fast. I've taken to tieing a knot in the pull-down line to keep it from coming all the way up while blast reaching.