Okay, here's where we are now. I went to the pool store and took the part number and the light model number. They didn't even look at it and sold me a screw. When I looked at the receipt, the part no. was S03593 I think. We tried to put the light in. First, it seemed that the screw would not go in because the liner had not been trimmed properly. (The light has been out since we got a new liner last year.) Anyway, we trimmed that, but hubby said it seemed like the screw was too short. It's 1.5 in. long. Should the screw be longer? He had to go out of town for a few days, but he is going to Lowe's when he gets back. I'm thinking if this is the wrong screw, it's not going to help for him to get a longer version of the same screw. I actually had already gone to Leslie's, but they did not have any. I'll be waiting for you guys to tell me what to do. Also, any other suggestions would be welcome.