I did select the text and have now also tried it with and without selecting text, but... nothing happens. I've seperated 'End' and 'With' with a space and same result. I think I'll just have to accept that it isn't possible. Do you get a result when trying it out in Word?
Maybe something interesting to know future-wise: which of these coding lines makes (or at least should make) the font go smaller with 0.5pt?