STEP FIVE
Add the extension panel to the bottom of the door with 4
mini clamps. Line up the extension panel with the door. The
black, oval nuts should be in the lower channel, facing up
(you will need these to reattach the door sweep in Step 7).
Begin with 2 mini clamps on the front side but do not tighten
them too much. On the underside, place a mini clamp
directly behind each mini clamp on the front side. Alternately
tighten the clamps until the panel is secure and even.