In this ongoing saga I have twice tried to cure the oil leak which is believed to be coming through the quad ring in the oil passage located within the water inlet passage. First attempt was with the ring glued in place and the second was with it dry taking particular care to ensure it remained in place during assembly. Neither worked as air can be heard bubbling into the water inlet passage when listening through the small inlets on the front of the skeg. It seems to me that the quad ring is slightly too large to sit in the recess in the gear-case. Is that correct? Several people have said that this is never a problem so what am I doing wrong? Many thanks.