Crane System". Cinegrips Services are the first to introduce GF-16 Crane System The GF-16's adjustable mounting column allows assembly of the arm at a low, comfortable pivot height of 158cm 5' 2". When assembled, the complete arm can be elevated 40cm 18" per hand crank or motor driven with a battery operated screwdriver.The 2-part counterweight bucket system splits to an 80% 20% divide of the total counterweight. The main bucket has both a high and low mounting flange.