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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. Nothing ? ok I must have gone the wrong direction, then pushed all the way toward - Nothing happened. Ok this is annoying, all the way toward + nothing here I am, what I'm I missing? How come moving the regulator arm from - to + does not make any variation? I'm lost