Hex drive 1/4", Rotor shaft O.D. 0.493"
Housing to outer rotor clearance: 0.004"
Outer rotor to inner rotor clearance: 0.003"
Minor scoring on the rotor parts and housing
Hex drive 1/4", Rotor shaft O.D. 0.563"
Housing to outer rotor clearance: 0.005"
Outer rotor to inner rotor clearance: 0.004"
May be an aftermarket replacement