I'm sure this could be sorted out really easily. Does anyone have the instructions which came with their focusers?
The problem is we have two respected printers, Fred Picker and Gene Nocon mentioned in this thread who's suggestions are complete opposites.
One says use paper, the other says don't. I know the majority do and I don't. It is human nature to defend the way you do something as being right even if you have no proof so a bit of guidance from the focuser manufacturers would be really useful.