Hi Arch, I cut the nose off of a Spark Dynamic, I’m not sure if that would be required for the Spark Evo. The spinner on the Dynamic is 64mm but the contra is 82mm, if the spinner for the Evo is around 82mm then I doubt Robert would want to remove a portion of the nose. Robert could build a new rudder, I’ve done several sets of built-up rudder parts by hand but they did not have a flare at the trailing edge just a thickened trailing edge. I’ve attached a plan and several pictures of what I did for a built up Xigris rudder, since it was all straight cuts it was easy to get the rudder parts and jigs at the same time.

Dave Snow