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Don't be so hard on yourself!
The crown race is an interference fit so shouldn't just drop into place, but wear & tear can affect how tight they are.
There are also different standards, but unless you're messing around with old bikes, the difference is quite apparent.
Some crown races are now split to make fitting and removal easier.
Do you know anyone with the correct tools to fit it?
I'm dumb as dirt, as I didn't know they needed some force to sit in place - I thought they sit flush naturally.
Understood now, all good. Sorry for thread opening for my dumbness.