Abstract: A siding cutting tool comprises an upper plate, a base, a siding support assembly attached to the base and adapted to support a piece of crude siding, and a top notch cutting assembly. The upper plate is movable with respect to the base along a vertical direction. The piece of crude siding has a top lock with a bent or rolled over shape. The top notch cutting assembly includes a top cam plate and a plurality of notch cutters attached to the top cam plate. The top cam plate moves along a top cam plate direction extending at an acute angle with respect to the vertical direction and the notch cutters cut the top lock along the top cam plate direction as the upper plate moves toward the base plate along the vertical direction.

Abstract: A mixer includes an elongate shaft having a U-shaped slot at one end and a mixer blade seated within the U-shaped slot extending to either side of the shaft. The mixer blade includes top and bottom beams extending to either side of the shaft with alternating convex and concave rungs of uniform width extending between the top and bottom beams. The top beams bottom beams and pairs of adjacent rungs define flow passages that vary in width from the top beam to the bottom beam.