It's possible to get feet for the beam running down the middle of the bed, which will hopefully spread the load enough to save the screws
https://www.thebedslatscompany.co.uk/fully-extendable-universal-centre-support-beam-support-foot-black
The centre rail is very strong as it's a hardwood board on its edge.
But maybe I could fix an additional rail near the side and fit a couple of those feet.
I think I'll try glue and screws for now and see how it goes.
Countersunk machine screws and some nuts?
@ChasnotRobert started
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It's possible to get feet for the beam running down the middle of the bed, which will hopefully spread the load enough to save the screws
https://www.thebedslatscompany.co.uk/fully-extendable-universal-centre-support-beam-support-foot-black