Turnbuckle Chain Tool
This tool consists of two clamps joined by sprocket type (bicycle) chain. When clamped to cable and fittings at each side of the turnbuckle, anchor the cable to allow free adjustment of the turnbuckle. The adjustment becomes a two hand instead of three hand adjustment.
A little sloppy on the chain, other websites sell this one and turnbuckle wrench included for the same price :(