Calling all tinkers!

After a rough last job, I had got to thinking of expanding my arsenal. Carrying around a few small metal balls is fine but I need something more

I have an idea in my head and I would like someone to build it for me. A belt that has an extendable metal like whip hidden inside. Something that I can comfortably wear all the time and if I need to go to the airport it won't draw too much attention.

Anyone?