MVA Sharps mid range sight ?

[Lumpy Grits]

Can you see that the plastic washer is in fact, in place?
Try this-remove eye disc. Then remove plastic washer from eye disc. Reinstall eye disc without washer, and see how far the eye disc will screw in till it stops.
Now, look at the gap that is now left between the back of the eye disc and the staff . Is it less than the thickness of the plastic washer? It should be-That will show you, that the eye disc is clamping down on the sight's staff when tightened with the washer in place.
If need be, a brass #10 washer works well in place of the plastic one.
Gary