Abstract: A splined sleeve assembly is provided for use on a component support apparatus such as a clutch jack or the like. The support apparatus includes a base, a lift arm supported on the base for movement between a lowered position and a raised position, and a piston and cylinder assembly connected between the base and the lift arm for moving the lift arm between the lowered and raised positions. The support apparatus also includes a hinge plate supported on the lift arm for pivotal movement between raised and lowered positions, and the splined sleeve assembly includes a cylindrical support shaft adapted to be mounted on the hinge plate. A tubular sleeve presents a longitudinal axis and includes a cylindrical inner surface sized for axial and rotational sliding receipt on the support shaft, and an outer surface that includes a plurality of longitudinally extending splines adapted to engage a clutch or other component.