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Hi Dave,
From what you describe it looks like the complete lens cell assembly may have come loose from the tube. If you retract the dew shield back as far as it will go so you can try and grab hold of the outer fixed housing portion of the lens cell from inside of the dew shield, without putting finger prints or smudges on the lens, you might be able to secure it. Alignment of the objective elements should not be affected as alignment is controlled via three collimation screws on the lens cell. On another note are you sure the dew shield hasn't just rotated.
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