Here is my version of the very handy "Wire clamp tool", similar to the one in this illustration.It is used to clamp tubing - using wire.
Picture of How I Made it
Wire clamp tool - cheap and easy! - 2
As requested by r-philp, here's a write up of how I made my wire clamping tool. This is simply a loose copy of the Clamp Tite brand tool. It is not to scale and.
Picture of Turnbuckle Wire Clamp Tool
This is simply a loose copy of the Clamp Tite brand tool.