Well, that tortuous loop has come to its end. I just had to try "once
more". And that did it, now it works as it should. I am not quite sure
what was it that i made differently, but on that last disassembly i
fiddled with the focusing helicoid and itīs bronze coloured counterpart...
Thanks for your tip anyway Rob, iīll keep that in mind when i have to
take also the aperture mech out of the lens !
Niko