Replacing Interior Door Doorknob Question

Over ten years ago I pretty much replaced all the doorknobs in our house as the old ones were corroded or scuzzy looking. Our house is over 50 years old and the hole in each door was sort of just a half moon shape, or half circle shape, and replacing the knobs was quite easy. THis weekend I had to replace another one and I went to two different stores and it seems the standard now is the hole in the door is a large circle. Am I right that this is the new standard? Or does anyone know if I can still get the doorknobs that fit the smaller half- moon door hole?
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I've been putting locksets in doors for over 20 years now, on doors dating as far back as 80 years and they all had round holes in the doors. New doors, old doors, original locksets... all with circular holes.
How would you drill half a hole? You'd have to cut it by hand, and that's not "easy" in my book.
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wrote:

My house is early 1800s, and I have yet to find a door with a round hole. I've found half-circles but mostly small squares, which were clearly hand hewn, like everything else in the house. The real problem I have is that all the exterior doors are much too thick to accommodate modern handles or locks. When I had to replace the knob on the front door I had to have the locksmith make one custom. I had a very funky knob on a set of interior french doors which had all sort of hole and slits. I ended up getting a regular doorknob had to fill in all the holes and slits and repaint the door. The locksmith bought the glass knob, brass plate, and the broken metal pieces from me to use to fix other older doors. As I recall, it ended up being an even trade, even though he had to make a house call.
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On Nov 24, 9:19 am, snipped-for-privacy@rochester.rr.com wrote:

Interesting that you've never come across this. I guess it is best described as a D-shaped hole which the stem of the lock set goes through, and at least in my area it must've been standard because when I replaced our doorknobs over ten years ago they fit fine!
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