Harrian bereziki zuloa egiteko burdin ziri bihurria; eskuarki eraztun izeneko tankateko bat izaten zuen barrenolaria busti ez zedin. Barrenoaren aho zorrotzari entrama deitzen zaio. Barrenolaria burdin pieza horiek forjatzen dituena zein barrenoak irekitzen dituena izan daiteke.
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