The reason I've choosen such strange construction of correction plate is due to fact, that:
1. It's almost impossible to take pole down to place, where I can weld it (huge weight, no helper, no one wants to risk with dealing with such heavy things (about 60kg) at such heights, most people are afraid of height, but I'm not). Of course, I can rent a crane, but this will impair my budget heavily
2. My welder is quite portable, and I can take it to roof, but hardly can use it there - roof is covered with bitum soaked fiberglass - will catch a fire from single spark. I have seen such example at the opposite building - firemans have to use helicopter to deal with fire (we have constant winds here, not too heavy, but very fire assisting).