Definitions from Wiktionary (tommy bar)

▸ noun:  (engineering, machining) A cylindrical iron or steel bar used as a lever; thus:
▸ noun:  A short bar put through the hole in a socket spanner or box spanner to provide leverage.
▸ noun:  A bar used to loosen or tighten some types of chucks and tool holders on machine tools such as lathes or milling machines.


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