What the thread found

• The Allen key for Pro Arm is a 5/32 inch straight hex type, not ball-end.
• The same 5/32 inch Allen key size is used to lock and unlock the top stage of a PRO head and to adjust the post and gimbal on older PRO models.
• Replacement Allen keys of this size can be sourced from electronics distributors or obtained directly from the manufacturer.

Depends on

• The discussion references older PRO head models; compatibility with current models is not confirmed.
• Specific supplier availability and pricing information from the original thread may no longer be current.

Parts

Top Stage

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