What is this metal ring for?

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Old 06-16-16, 09:18 PM
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What is this metal ring for?

I have replaced a bunch of door locks in my properties and I have always thrown this part out. What is the purpose of this metal ring?

 
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Old 06-17-16, 03:08 AM
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Some door installations, like mobile homes, don't use mortised plates for the lockset. This ring keeps the plunger centered in the hole. For the most part they aren't used.
 
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Old 06-20-16, 05:30 PM
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This is an adapter to convert to a "drive-in" latch, where, as Chandler indicated, the door edge is not pre-mortised for a latch-plate. It's a time/cost saving gimmick that usually results in a less secure installation.
 
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