What the thread found

• A crack in an arm collar can suddenly fail under load and pose a safety risk.
• Mismatched arm post diameters between different arm models create excessive play and torque on the gimbal handle and arm connection.
• Gaffer tape alone cannot adequately compensate for diameter differences between arm posts due to the high torque involved.
• An offset bracket with gaffer tape on the smaller post can temporarily secure two different-sized arm posts together for emergency operation.
• Dedicated adapter posts that convert between 5/8 inch (3A and PRO arms) and 3/4 inch (Master arms) are a proper solution for post size mismatches.
• Adapter posts from equipment suppliers like Betz provide solid connection without the play and instability caused by tape or other padding methods.

Depends on

• The offset bracket solution is described as temporary and not equivalent to using a properly matched arm.
• Adapter posts mentioned were formerly manufactured by one supplier but that supplier stopped production.
• The specific availability and current sources for adapter posts may have changed since the 2007 discussion.

Gear in this thread

Master Seriescatalog

Parts

Arm Post

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