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I was watching a programme about the raid. I had a thought what if insted of bouncing bombs they had used tallboys would have that changed the raid they could have come higher which would made the run in easer and the aiming less stressful as they would bot have to use string and pencil or bits of wood. What do everyone think. This suppose rather than working on a Bouncing bomb Barnes Wallis workind on Tallboy,Grandslam so it was ready ealier