Thanks for taking the time to answer @fred41 ,
I would have thought changing the values in the LGS / Global Device Settings would change the strength of the spring whilst holding it, but that doesn't seem to make any difference until I have started simFFB.
After having started simFFB I can hold the stick and have resistance. Starting LGS allows me to set the global effects strength in the profiler.
Now, oddly enough, if I close both simFFB and LGS (right click in start bar), the effect stays (I can hold the stick and it will not go limp).
So in order to play any game I need to first start Logitech Gaming Software (LGS) + simFFB so that the stick will push back when I am holding it?