I think you need this;
https://www.parktool.com/product/bottom-bracket-tool-bbt-9?category=Crank%20%26%20Bottom%20Bracket
I have one you are more than welcome to borrow.
Thanks Andy, but I have that tool already. It’s the outer edge splined lock ring I think I need.
I ordered one.
Ah, okay. Yes, you'll definitely need one of those.
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I think you need this;
https://www.parktool.com/product/bottom-bracket-tool-bbt-9?category=Crank%20%26%20Bottom%20Bracket
I have one you are more than welcome to borrow.