@DaleKramer: your suggestion to set all non-slip faces by hand may be a burden on operator, when thousands of those faces waits in lists. 
I stopped to specify them by hand, when moving to different geometry formats (from STL). Now that tedious phase is 5% of what it hase been. 
Moreover, with the project now handled by @sholz (look at it again), he may miss a ‘piece of house’. It would ruin his simulation.
Well, it is my take. 
Cheers,
Retsam