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Old November 30, 2012, 12:33 PM   #7
James K
Join Date: March 17, 1999
Posts: 24,160
The S&W sight is its own spring for sight elevation; the screw pulls it down instead of pushing it up. The little "nut" fits into a slot in the frame that holds it in place and keeps it from turning. You will see that when you remove the mount.

Jim K
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