Motion furniture includes a frame with a side mechanism having a torsion activator that may be actuated by a user to impart a motion on a frame member or to bias a frame member in a desired position. The torsion activator includes an activator bracket and an activator arm pivotally attached to the activator bracket. A torsion spring is disposed between the activator arm and the activator bracket. The activator bracket is configured for attachment to a frame member on the side mechanism, such as a seat plate. The torsion activator includes an activator bracket having proximal and distal ends, and one or more press-fit fasteners are disposed on each of the proximal and distal ends of the activator bracket. Each press-fit fastener is configured for insertion into a corresponding hole on the frame member allowing uni-directional installation of the torsion activator using manual or automated assembly.