Here is a link to a website selling the clutch. I read on some web site that you can use a slotted wrench to remove the clutch although I don't see where the wrench would engage?

https://www.repairclinic.com/Shop-For-Parts/a26b323-x7462353635656320636c7574636820617373656d626c79/Tb565ec-Clutch-Assembly-Troy-Bilt-String-Trimmer-Parts