Hayward valve- newbie Repair question

yeah, super easy

you need to knock the pin out of the handle using a hammer and hex key (or similar blunt rod) to dislodge the pin. once the pin is out just take off the handle and replace the non metallic washer and reinstall the pin with the hammer.
 
okay I believe you are looking for a SPX0710XC depending on the multiport valve you have regardless it is called a Key/Stem Assembly
it contains that shaft you are talking about try googling images just to make sure
 
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