Quote:
Originally Posted by Superman
Follow-up question. The beveled-tongue thingie which works with the regular door handle (not the deadbolt) has two parts. I have never understood why this is a two-part thingie. Perhaps someone can explain. The main question I have, however, relates to whether both of these parts must fit into the hole in the door jamb or, alternatively, whether only the larger part enters the hole.
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That's a confusing question but it's your lack of understanding the names of the parts. No problem, I'll answer only how it's done and if that answers your question, good.
The latch face plate is mortised into the edge of the door. Sometimes the latch ass'y comes with 2 plates, a square corner and a round corner to be used when a router and a template is used to cut the mortise. No squaring off the corners.
The purpose of the plate is to hold the latch pawl secure and guide it as it is depressed and extended. Without the plate there would be no place for the door edge screws and the latch mechanism would be pushing and pulling against the spindle shaft likely ending up loosening the rose plate screws over time.
The rose is the round plate that the knob goes through on both sides.