Step 4: Fold the plastic liner over the top of the cage

Cut a deep slot in each corner of the plastic liner down almost as far as the cage.
Using a heat gun and brute force, heat and bend the plastic flaps over the cage rim. Use clamps and lengths of wood to hold the flaps in place until they cool.

Note: This step is made easier if you can do this on a warm windless day or inside.
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