A busbar for use in a busbar assembly, the busbar having an elongate body portion structured to be generally disposed about, an in contact with an elongate inner component, the body portion being formed from a conductive material. A preload imparting member is attached to one of the bearings, the preload imparting member being configured to bias the rotor shaft in one direction and to apply a biasing force to make a housing and a flange, which constitute a chassis, come close to each other. The first linkage assembly is configured so that: a) the first linkage part is movable relative to the first body around a first axis; b) the second linkage part is movable relative to the first linkage part around a second axis; and c) the second linkage part is movable relative to the second body around a third axis. The clamping ablation tool can include a lower arm that mates with the upper arm.