banned implement like a screwdriver
A screwdriver is not a "banned implement". If it were how could engineers work? It should be carried if necessary and security told that it is a necessary tool of the trade.
Security regs quite specifically permit carrying "tools of the trade" and if a case can be made that a screwdriver needs to be carried by a pilot then security cannot stop you taking it through or they are preventing you from doing your job.
I only gave up carrying a Leatherman tool in about 2008 when we started doing an appreciable amount of positioning as pax but up until then had carried it every working day for 20 years. It had been spotted by sec search precisely twice since Sept 11 and on both occasions security (STN & GLA) agreed that it was permissable as a "tool of the trade".
Perhaps we are too quick be beaten by voluntarily succumbing to "rules" in our heads that don't exist/aren't valid in practice?