Symmons Model B

Hi Folks.. I have a Symmons Model B shower only valve. Recently, the voume/diverter handle has become loose, and floppy, and no longer changes the volume of the spray. I have the original diagram and I'm wondering if my best bet would be to replace that "diverter/volume spindle...and if so..could I see that that was the culprit just by looking at it? I have to shut off the water to this shower before i try to remove that spindle? Appreciate any tips or suggestions.... Thanks, John
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