Jon and Andrzej were better with heights than I was, so they kindly took over on the roof. Jon used rebar and some rope around his waist to stabilize himself and screwin the lower portion of the roof; Andrzej trusted his feet and screwed in the top portion. I eventually filled in a great many screws by folding a sectional ladder over the apex and climbing up and down. It was better than lifting weights at the gym to give me strong legs!