Catalyst Gasket

I tried out my new Catalyst fermenter on my Pliny the Elder clone, and when it came time to bottle tonight the rubber gasket that goes around the lid came off. I know it’s designed to come off in order to clean everything, but it’s a serious pain in the butt to get back into the lid, after about 15 min of trying I got frustrated and decided to give it a break for now. Anybody come up with an easy way to get the gasket back into the lid where it belongs?