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I'm impressed with the depth of knowledge and help on this forum! I'm thrilled to find this awesome resource. I'm in the beginning of my journey in watch repair. I'm a former automotive tech turned desk jockey. I fell deep for the magic of watches and it didn't take long for me to want to open them up and see how they work. I was thrilled to use my hands again, and watches take up less space than project cars, so the wife is happy too!

I've passed the first 2 levels of Mark's courses, and they were immensely helpful. I have "serviced" a few junk movements, broken a decent watch (hairsprings are delicate!) and finally last week had my first successful project: a Seiko 4006a-6031 which came with a broken crystal and non-working calendar works. Its now keeping time within 5 seconds a day with no beat error!


Next steps: taking level 3 of the courses and troubleshooting a vintage Benrus that I just can't seem to regulate in. 


Anyway, nice to meet you folks, looking forward to learning from you all. 

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Thank you!

Not sure if I need a new post for this... but since you asked!


Got a Benrus model A10 (eta 390) that I've serviced and with a fresh mainspring. It runs way to fast.

I've tried:

  1.  New mainspring (had low amplitude to start)
  2. Demagnetize
  3. New hairspring and balance wheel from a donor

I got the amplitude up, but the numbers are the same even after the transplant:

 The beat error especially is what is throwing me off- its virtually unchanged with a different balance so it must be something on how its mounted?


Any ideas would be so appreciated.



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