BNE security seem to be over to the top, i had 11mm spanner with me, NZ security let it through, they just wanted to 'sight it' back through BNE, no you can't carry this, put up a small arguement and left with out, I looked at the rules and you can't carry sharp objects/tools or 'tools/objects large enough to cause bodily harm'. I will dispute it next time.
like a lot of guys have said, they have thier job to do...