Why go to all the trouble of dragging a bench over to the cable machine?
Do 'cable claps' instead. Pulleys at head height, arms outstretched. Now 'clap' your hands at about chin height, such that when your hands are together, they are directly in between the pulleys (i.e. not like flyes where your body is in between the pulleys and your arms travel forward). When your hands are 'clapped' together, the cables should be perpendicular to your arms.
Move your hands about a meter apart and clap for however many reps you want. It's a lot like a pec dec, but you get to adjust the pulling angle so that it's slightly downward.