What the thread found

• Socket block pin breakage is a known failure mode in 3A arms that can occur due to fatigue or improper mounting load conditions
• Orienting the socket block at the 12 o'clock position creates excessive downward force on the center pin, causing it to function like a diving board and leading to shear failure
• Mounting the socket block at approximately 3 o'clock position distributes load more evenly on the center pin, making it function like a stabilized axle rather than a lever
• The center pin should be stabilized by screws at the top and bottom when properly oriented, preventing the mechanical failure seen with 12 o'clock positioning
• The socket block pin component is known by multiple names including rod end bearing and Jamaica Aurora

Depends on

• The advice is specific to 3A arm models
• The 12 o'clock orientation problem appears theoretical but unconfirmed by all participants
• No consensus on whether 2 o'clock to 3 o'clock is always safe or only sometimes acceptable

Parts

Hard Mount

Same gear or parts

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