Just to add to this, My son In Law has a (A1) Computer brain, very well educated, but common sense, as this as S---T, Example, we were moving a shed in their new house, distance about 30 ft, he wanted to strip the shed completely in turn, replacing the roof felt ect, my way was to use 3 scaffold pipes under the shed 6 persons, 3 each side to do the lift, he said what a stupid Idea, I make a fool of his so called brains, I was called a silly Basd for even suggesting the Idea.