My wife loaned me out to her sister to repair a fawcet. The three knob shower fixture needed all three washers replaced. That was the easy part.

For some unknown reason, other than being brain dead, I cannot get the diverter set properly. Regardless of which way I bias the knob, I still get water from the shower head, tub fixture and water spilling out of the dirverter knob.

What in heaven's name am I doing wrong?