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#53729
david pierce
Participant

    Bernard,
    From the top picture it looks like when the chain is wound, the sprocket tooth is up against the weight side of the link. As the clock runs, the weight and chain move downward until their combined weight overcomes the friction of the chain guide. At that point the chain links will slide to the other side of the sprocket tooth which is about 1/2 of a link.
    david