I noticed today my diverter wasn't working because the spring broke. When looking at the manual to grab a replacement part number I noticed that it looks like a "roll pin 1/8 x 7/16", item 19 in the pic, is between the spring and the plunger. I didn't see this part floating around in the bottom of the cabinet to see what it looks like. Can anyone help confirm what this is and if I need it, or does the spring just hook onto the plunger.

Could someone snap a pic of what theirs looks like so I can see how this thing should look back together? I'd greatly appreciate it. Thank you!

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Thank you very much!