So now we know that the screwdriver in question was the one the Trainee mechanic lost and the pilot had obviously used(his DNA being present). I think it quite likely, given these factors, the pilot may have left the screwdiver there himself. As i alluded to in my first post. Without getting into a theological debate, i would like to say, with the best will in the world, when your times up, its up! I speak as someone who lost a kidney in a motorcycle racing accident, and came quite close to the check out! As a consequence i look at life in a different perspective.