I can't figure out how to unscrew or lift any of the three "nuts".

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Try pulling one of the brass knobs laterally away from the glass.

Sometimes they are spring-loaded and you can pull them which allows you to drop one side of the glass and pull it out of the other two

  • 1
    also try unscrewing them if they do not pull. – Jasen Feb 10 '19 at 9:50

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