How were separate legs and handles attached to Chinese bronze vessels?

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Chinese bronzes Bronze gu from Anyang, Henan province, China, Shang dynasty (c. 1600–1046 bce); in the William Rockhill Nelson Gallery and Mary Atkins Museum of Fine Arts, Kansas City, Mo.

In the production of ancient Chinese bronzes, components such as legs, handles, and other appended sculptures were frequently cast separately from the main body of the vessel.12

To integrate these parts, artisans utilized a technique known as a lock-on pour. In this process, the separately cast elements were positioned in the mold, and molten bronze was poured into the assembly, effectively locking the pieces together as the metal cooled and solidified.12