500mm screws? 600mm screws? Even Noah didn"t use screws that big. Mind you, he didn't have a modern cordless!
I was going to say - your bedroom might have ended up like something the Marquis de Sade created!I found a helpful youtube vid where the person used 4x500mm screws, I would have thought 600mm but seems to do the job.
Add a strip layer of 6mm ply
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