Can anyone advise please? I have a lovely Japy Freres crystal regulator clock (here in the UK we use the term "Four Glass Clock). Made in 1875 and is not running at all, just stops after a couple of minutes. The mercury pendulum suspension spring had a slight kink so I replaced it but the clock is still not working despite the movement appearing to be 100% immaculate and I have oiled it (sparingly). I had to assume the spring was correct in length so the new one does match very well but for all I know some previous owner may have fitted an incorrect spring. The numbers at the bottom the back plate show 5 2 although it could be 3 2 as the first number is "smuged". How do I convert the two numbers to either mm (ideally) or to UK and US inches? Any advic e would be appreciated. Also when I measure the length of the pendulum is it from the hook suspension point down to the very bottom of the pendulum?
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