A rotation shaft includes a body, a threaded rod, an anvil, a linkage, and a biasing member. The body includes a threaded portion disposed along an inner surface of a longitudinal throughhole. The threaded rod includes a distal end, the threaded rod configured to engage the threaded portion. The anvil is coupled to the distal end of the threaded rod. The linkage is coupled to the anvil. The biasing member is partially disposed about the linkage distal of the anvil, wherein rotation of the threaded rod translates into linear movement of the linkage relative to the body.
