Don't know how to properly wind Elgin 400 day anniversary clock
Wind the clock until there is a sudden increase in resistance (it is then fully wound). So not apply a great force, as older clocks may be weaker and overloading the spring may break the termination and result in a new spring being required.
If you think it is becoming too stiff, just stop winding and see how long it runs for. I have often heard the term "over winding at clock" but have never quite understood the term. As a retired engineer I think that springs that break because of overenthusiastic winding are probably near the end of their life anyway.
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