While not the most important of door knob parts a rosette is the plate behind the door handle or lever.
Door handle pieces names.
Door handle parts names.
While the rosettes in most homes are simple metal pieces they can be elegantly detailed and some door handles particularly those with vintage designs do not have a rosette at all.
Understanding the different parts that work together to make a door handle and lock work can help you fix minor problems on your own.
The bolting mechanism has a spindle that retracts from the door frame when one of the handles is twisted allowing the door to open.
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