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What is the part number for a T-pin used in Schlage residential cylinders?
In the Schlage residential compressible cylinders, a T-pin style top pin is used. The part number is F506-451. It is available for sale according to the Residential Price Book.
Here are a couple images of this T-pin.
Here's a cut away image of the 29-018 residential compressible cylinder with the F506-451 top pins (orange arrow). 
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