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I need to replace this old ceiling box. I'm wondering if I have to remove it from the attic (not easily accessible). I don't know what was used to attach it to a joist (or whatever). It's not a screw. Thank you.
It's a bog-standard plastic box, attached to a metal bracket.
Drill out the rivets holding the box to its bracket, or just cut the thing into bits.
They were rivets. Had to tear apart from below. Worked fine.
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