What serves as the first pivot point when attaching the swing-away extension to the boom?

The front support bracket serves as the first pivot point when attaching the swing-away extension to the boom due to its structural role in providing stability and support during the attachment process. The front support bracket is specifically designed to anchor the extension securely while allowing for the necessary movement and flexibility required for operations.

This pivot point is crucial for ensuring that the extension aligns properly with the boom, enabling efficient operation and safety during use. When the swing-away extension is attached at the front support bracket, it allows for a more controlled movement, contributing to the overall function and safety of the lifting equipment.

The other options, such as the rear counterweight, main pivot pin, and base plate, play significant roles in the crane's operation and stability but are not directly involved in the initial attachment of the swing-away extension to the boom. Each of these components has a different function, such as counterbalancing the crane or providing a stable foundation, but they do not serve as the primary pivot point in this specific attachment process.