Thanks for your posting! The method above is to be done at your own risk. Canon cannot be held responsible for any damage that may be caused by anyone attempting this process. This process may increase the repair costs if the lens is damaged. For additional questions about this please contact our Technical Support Team via Email at http://Canon.us/SupportCF or by phone at 1-800-OK-CANON (1-800-652-2666) weekdays between 8 AM and 12 AM ET and Saturday from 10 AM to 8 PM ET.
We hope this helps!