Our reps have excellent movements, whether it be the ETA 2836-2 or the Asian 7750, and both can attain COSC standards (-2 sec to +6 sec/ 24 hrs.) if properly regulated. For us novice without the complicated machines, we just do it by hand by trial and error while comparing it to the atomic clock.
The ETA 2836-2 mov't is easier because it can be fine tuned by simply turning a screw (+ -)
But the Asian 7750 is quite tricky since it cannot be fine tuned by screw. You have to push the little notch a fraction of a millimeter! (Counter clockwise if it's running too fast; clockwise if it's running too slow) It's quite touchy that you really need a very steady hand for this task (and a loupe to verify that you've only moved it a fraction of a millimeter!). I've been doing mine for a week and I finally got it down from +20 sec/ 24 hrs. to +2 sec/ 24 hrs. It was quite an accomplishment after several trial and errors. Patience and determination is the key. I wish there was an easier way to fine tune it ... or is there is a tool we can use?
How do you guys do it, or do you even bother?
The ETA 2836-2 mov't is easier because it can be fine tuned by simply turning a screw (+ -)

But the Asian 7750 is quite tricky since it cannot be fine tuned by screw. You have to push the little notch a fraction of a millimeter! (Counter clockwise if it's running too fast; clockwise if it's running too slow) It's quite touchy that you really need a very steady hand for this task (and a loupe to verify that you've only moved it a fraction of a millimeter!). I've been doing mine for a week and I finally got it down from +20 sec/ 24 hrs. to +2 sec/ 24 hrs. It was quite an accomplishment after several trial and errors. Patience and determination is the key. I wish there was an easier way to fine tune it ... or is there is a tool we can use?
How do you guys do it, or do you even bother?
