I use this:
Amazon.com : Crank Brothers Multi Bicycle Tool (5-Function, Silver) : Bike Multifunction Tools : Sports & Outdoors
And, these:
http://www.amazon.com/Pedros-Bicycle...R382XC1XSSTS1K
Those levers are GREAT.
I, also, took the 6mm hex off the tool and replaced it with a flat screwdriver off the Crank Brothers multi-10 that I have.
Honestly, I don't even know how to break a chain or repair it.
S