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It can be difficult to find a new door knocker with the same BC dimension. Especially if the original one has been there for many years. There is no standard for the BC dimension. The BC for the most part is determined by the design of the knocker. The mounting lugs used to attach the hardware are usually placed at a thicker portion of the casting. This is to give them more strength. Sometimes you have to settle for a replacement that is close. If the two BCs are within 1/4 or 3/8 inch of each other you can usually enlarge the holes in the door a bit to make the fit. If you are lucky the existing mounting hardware will cover the enlarged holes.
There really is no limit in this genre because the knocker is meant to reflect the homeowners unique personality. Installation FAQ If you are installing a new door knocker the best choice is a rear mounted knocker made from solid materials such as brass or iron. These will be more resistant to damage over time and offer a wider option of intricate designs. Rear mounting does require the door to be drilled for installation but this prevents theft of the knocker and ensures it will not fall off or break away from the door. If you are replacing an existing knocker it is important to measure the pre-existing holes and choose a new knocker carefully.
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Pay close attention to what the door knocker is made of. Some manufacturers get away with making low quality zinc or pot metal castings look good for a short time using plating techniques. The problem with these is the good looks do not last. Soon the plating is chipping and pealing away and corrosion is taking over. What type of mounting is needed? Most door knockers employ either through the door mounting or surface mounting. Through the door mounting involves drilling holes through the door. The mounting hardware passes through these holes and attaches to the door knocker on the outside. On the inside decorative nuts are used to secure the door knocker to the door. Surface mounting uses screws to attach the door knocker to the door.