Does anyone have one of these (or similar) http://www.kiddicare.com/webapp/wcs...62_10751_-1_14054_60469_10001_14054#specs_tab I am having trouble fitting it to the bottom of our stairs, as there is a very high skirting board there. This means the the gap at the top is wider than the bottom. It gives a range of widths (72-78.5cm). Does this mean that I can vary the width? Sorry to sound so dim - I don't know how these things work!