A one-piece linkage assembly comprising: a linkage base formed of a polymer material composition, the linkage base being configured to be secured to a structure, the linkage base has two sealed pin connection seats (123, 123') each for retaining one of two ends of a first metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the first metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition; a linkage coupler formed of the polymer material composition and movable between a stowed position, deployed position and one or more intermediate positions relative to the linkage base, the linkage coupler has two sealed pin connection seats (123, 123') each for retaining one of two ends of a second metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the second metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition; a linkage follower pivotally connected to the first metal pivot pin through a first bore without a bushing between the first metal pivot pin and a surface of the first bore in the linkage follower, the linkage follower being pivotally connected to the second metal pivot pin through a second bore without a bushing between the second metal pivot pin and a surface of the second bore in the linkage follower; and a linkage drive formed of the polymer material composition and movable between a stowed position, deployed position and one or more intermediate positions relative to the linkage base, the linkage drive has two sealed pin connection seats (123, 123') each for retaining one of two ends of a third metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the third metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition, the linkage drive is pivotally connected to the linkage coupler by the third metal pivot pin extending through a third bore without a bushing between the third metal pin and a surface of the third bore formed through the linkage coupler, the linkage drive has a drive connection bore that is connectable with a drive shaft of the linkage base. a linkage base formed of a polymer material composition, the linkage base being configured to be secured to a structure, the linkage base has two sealed pin connection seats (123, 123') each for retaining one of two ends of a first metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the first metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition; a linkage coupler formed of the polymer material composition and movable between a stowed position, deployed position and one or more intermediate positions relative to the linkage base, the linkage coupler has two sealed pin connection seats (123, 123') each for retaining one of two ends of a second metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the second metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition; a linkage follower pivotally connected to the first metal pivot pin through a first bore without a bushing between the first metal pivot pin and a surface of the first bore in the linkage follower, the linkage follower being pivotally connected to the second metal pivot pin through a second bore without a bushing between the second metal pivot pin and a surface of the second bore in the linkage follower; and a linkage drive formed of the polymer material composition and movable between a stowed position, deployed position and one or more intermediate positions relative to the linkage base, the linkage drive has two sealed pin connection seats (123, 123') each for retaining one of two ends of a third metal pivot pin, wherein each of the two sealed pin connection seats (123, 123') prevents exposing the two ends of the third metal pivot pin to the outside environment by encasing each of the two ends in the polymer material composition, the linkage drive is pivotally connected to the linkage coupler by the third metal pivot pin extending through a third bore without a bushing between the third metal pin and a surface of the third bore formed through the linkage coupler, the linkage drive has a drive connection bore that is connectable with a drive shaft of the linkage base.