Thank you very much, Doug. This is Gipsy4 and I am the one, for whom Impi posted the request.
I did what you suggested and found out, that shifting into Forward by hand directly at the lever (control cabel detached) engaged the Forward clutch. It seemed to me, that the success on that was driven by the fact, that I could move the lever further by hand, than it was moved by the shift cable.
I did also the measurements and found out, that travel way between neutral and forward compared to neutral and reverse are the same.
Then I adjusted the control cable a bit, so that the shift cable attachment stud fitted into the inner hole (before it was in the outer hole of the lever), while in neutral. However, I moved the lever within the 5 mm or so freedom way in neutral to the forward gear side threshold. Thus the lever is now being pulled a bit more into forward gear direction by the shift cable.
The result is a lot better now, however still not perfect. Now, the forward gear does still not engage, when I put the lever in the Cockpit
just to forward idle. But it suddenly engages, when I push up the revs to, say 1500 and then go back to idle forward. In this moment it makes "click" and the clutch engages. As this process lasted up to a Minute before and is now back to 2 seconds, I can live with it, as long as it remains.
Any further comments? If not, thanks a lot for taking your time