Hi I have purchased a broken rs626 (basically a css 220). It's broken on the outside because of a 1 inch hole that broke off. I want to make it a recirculating skimmer. My main concern right now is how to remove the inside cylinder. I tried removing the top ring and couldn't, it's good glue. I could just break that cylinder to get it out. Any other ideas?

I will put pics later on, I don't have my camera at the moment.