fly press

noun
  1. a hand-operated press in which a horizontal beam with heavy steel balls attached to the ends gives additional momentum to the descending member used to punch or compress material
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Historical Examples of fly press