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In this video, I repaired this Gruen Precision 510. This is a very similar configuration to the watch worn by Sean Connery in the early James Bond films. The watch required a new 4th wheel as the old one was bent. We managed to source a NOS part from the USA. The balance spring required a lot of work as it had a kink on the section between the stud and where the kerb pins make contact with the balance. It took me around 2 hours and 30 minutes to sort this as I really wanted it to run correctly.