Those seem to be pictures of the forward and reverse clutches, not the automatic tensioning pulley and its ratchet. Here is the correct pulley (picture from this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=26533&Searchpage=1&Main=5954&Words=%22ratchet%22&Search=true#Post26533

[Linked Image]

I have put a red oval around the ratchet.