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@FraserBrooks
Right, I understand how that would work on the piece in the right of the last picture...
but it seems like I would only need one.
however, and this is where i will embarrass myself as i have never used worked on a BB before, on the other one the ring comes of and just leave a threaded outside with 4 holes, which looks as though a tool sticks into the holes?
Thanks a lot for your help.