After you last post on the trouble you had making a usable gasket from RTV, I thought I had better check the outcome of mine. Pulled one lens to check out the gasket that I made and found that it is what I thought it was, light gray RTV silicone molded to fit. What I also learned is that it is stuck quite well to the plastic lens! I can peal it off if I am very careful, only tried a small area though, I do not want to have to make one again! Here are some pics of the lens and gasket. There is no residue in the aluminum frame, clean as a whistle.