Update:
The bed frame couplings were very poor quality, the hooks were just tac welded in place so when you couple the joint the hook bends outwards.
I have turned some 15mm cherry dowels and will use them for alignment and provide support vertically (so I’m not just relying on the sheer forces on a screw).
I’ll probably pick up some brass slotted wood screws and countersink them
The bed frame couplings were very poor quality, the hooks were just tac welded in place so when you couple the joint the hook bends outwards.
I have turned some 15mm cherry dowels and will use them for alignment and provide support vertically (so I’m not just relying on the sheer forces on a screw).
I’ll probably pick up some brass slotted wood screws and countersink them