Arm posts
In some arms, the arm post is fixed and can't rotate at all; in other arms, the post is completely free to rotate on low-friction bearings. Many arms incorporate an adjustable brake system so that the operator can choose the rotation freedom he likes and alter it for any specific shot.
How free should arm posts be to rotate?
A completely fixed arm post is okay if the gimbal handle is somewhat (or completely) free to rotate on the post. In the old days of the Model I, II, and III arms, the posts were always fixed,and many operators added many different slippery (nylon or Delrin) washers inside the gimbal handle to make it easier to shift the gimbal handle around.
An arm post that is completely free to rotate makes it really easy to get ...
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