Buy on Amazon : br br Glidecam Smooth Shooter Support Arm and Vest for use with Glidecam 2000 Pro Glidecam 4000 Pro br br The Support Arm can be setup and used in either a One-Spring Mode or a Two-Spring Mode br In the One-Spring Mode the Support Arm can hold a total combined camera and hand-held stabilizer weight of 9 pounds br In the Two-Spring Mode the Support Arm can hold a total combined camera and hand-held stabilizer weight of 18 pounds