This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鎺 is uncertain. It combines 金 (metal) with 祖, but the reason for this combination is unclear.
The metal radical 金 suggests something metallic, but the overall meaning is unclear. Think of it as a mysterious metal object whose purpose is unknown.
For はばき, imagine a metalworker named Habaki who forges this mysterious metal piece: Habaki -> はばき.