The seal replacement on most pumps requires the capacity to separate the motor from the pump and to dismantle the wet end. Upon dismantling, it will become clear as to where the seal components are to be replaced. The spring half is found in the seal plate and must be knocked out and reinstalled with a properly sized driver and the ceramic seat is attached to impeller. Be careful not to damage the polished surfaces of seal. A light coating of a silicone or teflon based lubricant is most helpful ..