Aries: Apart from minor alterations, the Aries' basic design has remained unchanged in nearly 30 years, and it's earned a reputation as being rugged and reliable. Originally built in England and now manufactured in Denmark, the first mass-produced servo-pendulum windvane serves as a good standard for measuring those that have followed. Its formidable construction—cast aluminum, extruded-aluminum tubing, silicon bronze, and stainless steel—makes it one of the heaviest windvanes in this group. Galvanic corrosion can make cleaning or servicing troublesome on older, neglected models, but 20-year-old vanes that function perfectly are not uncommon. By turning a single screw, you can easily replace the plywood vane or angle it backward to dampen motion in higher winds. The vane swings on nylon roller bearings. Two lines control a toothed wheel that clicks with each adjustment and positions the vane to the apparent wind at 6-degree intervals. The servo-rudder is a semibalanced rudder made of foam-filled fiberglass. On older models, a breakaway tube on the rudder shaft affords 360-degree overload and collision protection. Newer models are protected from forward impact with a hinged shaft that eases raising or complete removal of the rudder. The vane-to-pendulum rudder linkage is a relatively heavy forked-aluminum rod linked to beveled silicon bronze gears with a 2-to-1 ratio. Nylon bushings at swivel joints also reduce friction on this linkage. The bearings for the pendulum rudder shaft are solid-plastic composite sleeves. The transmission lines are attached below the point of suspension, through built-in nylon blocks.