I can't get my lockring tool to fit my cassette's lockring. The tool is about 1mm i diameter bigger than the lockring, although they have "hills and valleys" that line up.
Here's the lockring:
Here's the lockring tool:
Here's the tool in the lockring before I try to engage the lockring with the tool:
And here's the tool nestling on top of the lockring, but it doesn't fit in at all:
The lockring says "LB SHIMANO" on it. The tool says it's compatible with Shimano Hyperglide. Do I have the wrong tool for the job?