I hadn't thought of reading the handbook, my 1980 version says that the windscreen fasteners should be last.
The roof is now on. Three minutes is impressive - my son and I did it in less than ten which is at least twenty minutes quicker than before. Mind you, it was snowing the last time.
As discussed in another topic, the four seater does not look its best with the roof up. I think leaving the sides open is better, the side screens seem to add to the awkwardness.
Thanks all for the advice, I'll take at look at the swivels.
~ian.