A door knocker installation that uses the through the door mounting method requires drilling holes through the door. Care must be taken when drilling these holes. [...]
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If you are preparing for a door knocker replacement and it is a through the door installation the bolt center dimension has added meaning. [...] The phrase Bolt Center references the geometric center of the diameter of the hole being drilled. [...] Surface mount uses screws that pass through the door knocker and into the door. [...] |
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