Step 1
Pull up the pop-up trundle from under the daybed. Remove any bedding from both beds.
Step 2
Place the T-shaped foam piece along the gap between the mattresses with the cross bar of the T-shape on top of the two mattresses and the bottom of the shape inside the gap.
Step 3
Cover the two mattresses with a fitted king-sized sheet.
Step 4
Tie a rope or a zip tie around the legs of the two beds where they meet to hold the beds together.