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I've repaired a few of these, having some success with stripping and cleaning the mechanism. They are so cheap though, its hardly worth the effort in many cases. -
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By SwissSeiko · Posted
Id love to see how he has the output shaft mounted to this setup, as I have the same rotary stage and stepper in my build. -
If you see at least one thread protruding, or even a half, then you may have a chance using this "tool", but don't squeeze hard. Lot's of patience, and if you notice any signs of loctite or other adhesives, then apply several drops of acetone on top of broken stem. Use heat (hair dryer) also. You should be able gradually turn it counterclockwise, just like i did on this broken Timex stem, which was glued with something like nail hardener. Then you can use an extender to save your broken stem. https://m.media-amazon.com/images/I/513DVvkfW5L.__AC_SX300_SY300_QL70_ML2_.jpg You can also try cutting a small grove / slot on top of the broken stem to use 0.7mm flat screwdriver. Depending on the Crown material and Stem material, you can try dissolving the stem. -
How long had it been without any wind before you first put it on the timegrapher? Perhaps there was some debris / old lubricant that loosened up while you were waiting to do the 24 hour reading? I recently serviced a Seiko 6319 that immediately after service was absolutely horrible on the timegrapher - 24 hours later (without me doing anything) it was rock solid! I was a little surprised by this (as I have seen improvements in amplitude after letting it run in but never a watch going from useless to great!). I was suspicious that some dirt must still be in there so I took it apart and cleaned and lubcricated it again and had exactly the same experience - snow storm that after some hours turned into a nice straigh line with good amplitude 🤷♂️
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