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    Yes,. the roller jewel does enter and exit the pallet fork, repeatedly.
    If you’re having trouble with a balance that is not moving consistently, there are more than likely a number of problems, and here are a few.
    1. Just plain dirty (or bent-broken) jewels, balance pivots, or the entire gear train needs an overhaul.
    2. Mainspring could be sticking, or really weak.
    3. Tangled or magnetized hairspring.

    If you can tell us a bit more history, maybe we can help you pin it down a bit ???