Step 5 · Secure the Flange Extender
Secure the flange extender to the subfloor. Your extender kit should include several long, corrosion-resistant screws. Using a drill or screwdriver, drive these screws through the designated holes in the extender ring, through the original flange, and firmly into the wood subfloor below. This step is critical for ensuring the entire flange assembly is solid and does not move, which prevents the toilet from rocking in the future.