Hello,
We are sorry you received a defective pole!
Yes, a fiberglass pole is significantly heavier than a standard residential aluminum pole, but the cam should work well to extend and contract the length of the pole.
Please reach out to ask for a replacement under warranty.
Should you need further assistance you may e-mail Poolmaster Customer Service directly with all details, pictures, etc and we will be happy to help!!e-mail: info@poolmaster.com
We do apologize for the inconvenience but are here to help with a resolution.