Thinking logically, the weight of the aircraft is supported by the wings in flight so it really shouldn't matter if the wings are a bit light.
Cheers anyway.
I'm still wondering why they bothered with concrete blocks at Boeing when the 74's first came out. The mass & balance suggestion could be an answer but I understood they did it with all of them, surely you could have calculated the M & B and wouldn't have needed to put concrete blocks on every aircraft. Can anyone confirm if it was done for that reason?