I have a Par fresh water pump on my H30. The electric motor works great, the diaphram does not have cracks, but the cam that attaches to the motor and diaphram has become detatched. I can slide the shaft of the cam back on the motor, but it continues to slide off. Is there a rebuild kit for this pump? It is a PAR automatic multifixture 2.8 gpm model 36990-0000. Any help greatly appreciated. Barry