Note: Use locking pin for element at position X
This message indicates that the locking pin must be used, because the backrigging is under compression load (and not tension as in most cases). “X” refers to the element whose backrigging must be fixed with the locking bin. As an example, “Use locking pin for element at position 1” means that the backrigging of the first element, which connects to the top frame, must be fixed with the locking pin in the frame.