This is the sink diverter all apart. There is a single slotted screw just below the divert knob. You might want to plug the drain in case you drop it. Pull the whole diverter out and twist the knob to unscrew it. I had to hold the other in a vice to get the knob off. The small shaft has two Orings that sit in a .233 groove. The Orings I chose is an R03 or R04. I think either would work.
* bdub note: I used a 3/16 X 5/16 for the center position and a 5/32 X 9/32 at the end.
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