I have a 1930's house with many original features including these old doors large crystal keys, locks and doorknobs. The handles fell off a door because the set screw would not engage. I took what I had and brought it to Home Depot. The guy helped me measure the size of what I had and said I could only modify his bigger screw which was really ugly and big. It would have been noticeable on the doorknob if I hadn't cut and filed it. So I took the size and searched for Revain and found this. Perfect fit and longer than the set screw I had there. They are ideal for older doors and very low profiles.
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