Pull back on the carpet where you will install the Z-bar transition. Measure the opening with a tape measure.
Transfer the measurement to the Z-bar. Cut the Z-bar to the appropriate length with a hacksaw.
Attach the Z-bar into place using 3/4-inch nails and a hammer. Pull open the top metal cover for installing the carpet.
Pull the carpet over the Z-bar carefully. Wear gloves to prevent injuring yourself on the carpet grippers. Tuck up to 1 inch of excess carpet underneath the main carpet.
Hold the carpet in place and fold the top part of the Z-bar over the carpet. Lightly tap the Z-bar closed with a rubber mallet to complete the installation.