[bojan]

For the focus, I adjusted the focus stop such that I just have to rotate the focus ring all the way to the end (focus stop is accessible after removal of front retaining rings with special tool with rubber pads).
So for me, focus is easy :-)
But then again, this is a good old, all metal manual lens (very rarely if ever used, judging by its condition) and I like to improve things (sometimes I manage to destroy them in the process.. not too often recently :-))