• Hey,

    I just swapped my handlebars and stem on a bike and I'm failing to tighten the topcap into the expender plug. The top cap & expender are spinning around without getting tight :(

    Video to illustrate as I'm not very good with words: https://streamable.com/d52eab

    Any idea on what's going on and how to fix?

    Cheers

  • Looks like when you unscrewed it, the expander unscrewed rather than the cap. So half of your expander is probably somewhere at the bottom of your fork steerer.

  • Yep, that's what I realized right after posting.
    Now I need to figure out how to get out the locking ring without damaging the steerer... ugggh

  • Definitely this.

    Flip the bike upside down and the bottom part should just drop out if it is not wedged on the fork crown.

    It's a delicate setup, you dont wanna overtighten it as carbon cracks, got access to a torque wrench? If not, time to source one.

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