I sad we have so many modern techniques magnets was just an example so if that doesn't work there are many other ways.
It was just an example of how it could work, in an competitive environment the way that button is pressed should off course be limited to a few persons, to ensure no one can cheat.
No
@AndyRM is asking for things he bloody well knows, as does everyone because the separate graphs are very public and show exactly what i said before, if he wants to put them all together it's on him to do that, won't change the results. and he knows that.