Harmony supplies Perception Kayaks with their options/accessories. With this in mind I purchased their rudder/control pedal system for my Perception Prodigy 13.5. The rudder raising/lowering lines are run down the right side of the boat. This system puts tension on the rudder inhibiting it's movement. The supplied control cable tubing is also too small (inside diameter) adding to the friction of the cable operation.
Happily, Harmony provided me with a full refund; I returned the system with my comments. I have replaced this system with SeaLect's system.