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Regulating a 7750 with Etachron



I'm having some unexpected behaviour from a eta 7750 that I'm trying to regulate after servicing.

I went through service procedure using correct lubricants.
Everything went fine. Actually I have some doubt on lubrication of incabloc wich I'm not sure I did correctly since I'm afraid that too much oil was placed in one of the two stones.
The fact is that when I finished I wasn't brave enough to clean and lubricate it again ... shame on me but I felt that task to be very very difficult.

Anyway after reassembling the watch I had it at my wrist for a week and it showed a great consistency at -10 sec a day.
It'a stop grade movement and resting at night in DU, DD 9UP and 3UP positions always showed something between -14 -6

I was very happy with that result and I thought that a little regulation would have brought it to a very fine time keeping.

Then I reopened the caseback and slightly moved etachron arm, that was resting in a nearly neutral position, in the + direction.
Nothing happened (measuring with timegrapher open source app)

Did it again, another slight push.

? ok I must have gone the wrong direction, then pushed all the way toward   - 
Nothing happened.

Ok this is annoying, all the way toward +

here I am, 
what I'm I missing?
How come moving the regulator arm from - to + does not make any variation?

I'm lost

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