Black & Decker String Trimmer Model ST4000 tap string advance doesn't work

[Auto Doc's]

Maybe this will help if you enlarge the page view:

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www.toolservicenet.com

 

[anthonyjaycorman]

Maybe this will help if you enlarge the page view:

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www.toolservicenet.com

That is incredibly helpful - thanks!!

 

[anthonyjaycorman]

I wonder if I've got the right spool - the replacement part here: https://www.partselect.com/PS101659...ourceCode=1&SearchTerm=ST4000&ModelNum=ST4000

...is stamped with a part# 2015 208F, and mine is stamped 2019 36. The stem it sits on is flanged, but there's nothing in the spool to catch those flanges and turn it.