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Hamilton 992 help


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I'm servicing a Hamilton 992 and it is running slow in the dial down position and I've tried everything and I'm stumped. Look at it under the microscope. I have cleaned and oiled it multiple times, no cracked jewels, no worn holes,nothing is rubbing or touching anything, hairspring is flat, mainspring is correct and new, no dirt or old oil, wheels are not bent or broken, nothing wrong with pivots. Runs fine in all other positions. I'm lost at this point.

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I'm servicing a Hamilton 992 and it is running slow in the dial down position and I've tried everything and I'm stumped. Look at it under the microscope. I have cleaned and oiled it multiple times, no cracked jewels, no worn holes,nothing is rubbing or touching anything, hairspring is flat, mainspring is correct and new, no dirt or old oil, wheels are not bent or broken, nothing wrong with pivots. Runs fine in all other positions. I'm lost at this point.

This is a place where a timing machine would be nice you didn't mention if you used a timing machine? Then very nice if the timing machine can measure amplitude. So timing difference between dial up and down with a timing machine you will usually see a amplitude difference. that will tell you that there's a difference between the ends of the pivots. Then what is your definition of too slow?

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    • That would be something! Which brings me back to;  
    • you think you're going to sleep tonight you're not, you're going to ponder the question of what makes you think those of the right parts?  
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    • Sounds like the story with my Rolex. Poor (expensive) job done by an official Rolex dealer with an "in-house" watchmaker, hence I learned watchrepair and did the servicing myself. Same story as I learned with the Omega 861, again poor job by an "in-house" watchmaker by an official Omega dealer. Once your watch goes through that back-door, you have no idea what is going to happening to it 🫣   Quite nice that they sent back the parts which had been replaced !
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