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Hi @Fresiako,
Thank you for your question and welcome to the Bunnings Workshop community, it is fantastic to have you with us.
Unfortunately, this is something you will need to confirm with the manufacturer.
I note that on the listing for this product they have mentioned in the safety and compliance section that "The TV bench must be fixed to the wall with the included wall fastener."
I'd suggest contacting the manufacturer to confirm whether this is something they consider safe to do with their product.
If they are happy for you to proceed, then you can likely use a square threaded tube insert alongside a threaded castor in a corresponding size.
Let me know if there is anything else I can assist with.
Jacob
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