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Disassemble and check the Elevation Knob, Index Elevation for burrs. You can do this by placing them on a flat metal surface. You may also want to replace the elevation knob spring with a newer, stiffer one. Same for the smaller spring. While you're at it, check the Rear Base for burrs or other deformities.
Small point of order, gunsmithing questions should be posted in the Smith Forum. Our members are happy to help, but help us help you. Thanks!
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