I submerge the light and without fail find the leak ...no matter how small...to be coming from around the gasket. It's frustrating. I have reinstalled the light, turned off the power at the breaker and will research some other alternative to my problem. I should have titled my post "tiny bubbles". I don't usually give up on a problem, but disassembling and reassembling this many times has left me TIRED! Thanks for your reply. I'm not a design engineer, but I think I could develop a sealing solution that would be almost foolproof. It might require something more sophisticated than the clamping ring currently used by Pentaire. It might be easier if I understood what they were thinking when they designed the unit. The pressure exerted by the ring is applied somewhat randomly, especially for the bottom portion of the seal. Again, thank you very much. Maybe I should pay a POOL LIGHT EXPERT to install and WATCH THEM DO IT. Always best to learn from a pro.