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TTM-
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.
andyp
You need lockring that has notches to tighten on the outside, usually the same interface as hollowtech 2 bottom brackets.