key-piece

DCHP-1 (pre-1967)

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the log which when released will free a jam (def. 2).

See: jam ((n.))(def. 2),key-log(def. 1)

Quotations

1891

The "keypiece" of the jam was fully exposed, and, once it was cut in two, would no longer hold the accumulation of logs together.

1964

Many a man risked his life in breaking up these [lumber] blockades with the handspike by skilfully extracting the key-piece of the jam. . . .