ETA 7750 sometimes not auto winding

[Delgetti]

So here I am back with my next 7750 problem. 

After reassembly the auto winding system sometimes doesn't work (yes, I know it only winds in one direction). As far as I can see its about the reversing wheel. I took this pic from Lawsons walkthrough to explain (red little arrow):

If the rotor rotates clockwise sometimes only the upper wheel in the pic rotates anti-clockwise and the lower stands still so the watch doesnt wind. This happens in about 70% of the tests I did. In the other 30% the lower wheel also rotates and the watch winds. Before service the watch didnt show this behavior, 100% wind.

 

So what could it be? I have to admit I didn't use V105, but followed the oil chart with 9010. Could this cause the problem?

 

[nickelsilver]

Sound like the clicks in that wheel are sticky. How did you clean and lubricate that wheel?

[Delgetti]

Cleaning in Elma 1:9 and after that in petroleum ether. Put tiny amounts of 9010 to the click bearings and the "round star" inside (that was what I found in an oiling chart). But the chart also said "very tiny amount". Maybe I applied too much?