Add Set Screw to Capture Takedown Pin Detent/Spring  

     Mount Lower Receiver in vice horrozonial, So you can see the detent hole in the rear of the receiver.  Make sure the Receiver is at a 90 Degree angle, you will be adding threads to the detent hole using a 4-40 tap.  The detent/Spring will be Captured by a 1/8 Set Screw

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