Install the second cross brace to both frames. Start at the highest point of the scaffolding. If possible, use the screw jack to bring the highest corner down closer to the sill. Next, you need to level and plumb the scaffolding. Install the diagonal brace to keep the scaffolding square. Check the level again and plumb if necessary. Fasten the leveling jack to the sills with either nails or screws.Next, bring all four corners up to that point. If the bottom cross braces of each frame are level with each other, then frames should also be plumb.
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