

Hi all,
I recently moved into a place where the previous owners had an egg chair hanging from the ceiling using an eye bolt (photo attached). I bought a similar egg chair to use the same eye bolt, but unfortunately I noticed that when someone is sitting and swivelling clockwise, the bolt starts to come undone. I suspect the nut may have pulled through the joist or something similar.
Is there any product from Bunnings that could fix this? I don’t have access to the roof space, so I can’t install another eye bolt. Would an eye hook plate with lag bolts work, or is there a better solution?