Abstract: A downhole tool (10?) comprises a body (12?) having a longitudinal axis and a body through-bore (14?), a slot (34?) communicating the outside of the body with the body through-bore. A sleeve actuator (30?) mandrel also has a bore and is selectively axially slidable in the body through-bore. A hollow bar (36?) is slidable with a radial component in the slot. At least two levers (210), each pivoted to the mandrel (about a first axis perpendicular the longitudinal axis) extend into the hollow bar and are pivoted thereto (about a second axis parallel the first axis). The levers lie in an actuation plane perpendicular the first and second axes and containing the slot. The levers are disposed at an inclined angle with respect to the longitudinal axis so that longitudinal motion of the mandrel translates into radial movement of the bar.