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Bob Tascione

    Hi Estanek70,
    I’m sorry. I should have read your original post better. I didn’t realize you had swapped the platform with one from another clock and received the same results. If that’s the case then is it possible that one or more teeth on the contrate wheel are skipping past the escape wheel pinion? If so this can usually be remedied by moving the platform in towards the contrate for deeper engagement. Another thing you might check for is contrate wheel runout which could allow teeth to clear and slip by the escape wheel pinion leaves during each revolution of the contrate. If all checks out ok then look closely for missing teeth on the contrate or any other wheel. This would produce the condition that William mentioned in his post.
    One last thing that you can check for is excessive contrate wheel end shake.

    Please let us know what you come up with Ed as knowing the final solution can be make this a very helpful thread for many of us.