Yes, after I sent the post it occurred to me that my tubing was brass and that it came from a hobby shop originally. So, I was hoping that if L85 found that was the problem he'd come back and ask questions. Glad you clarified that, Jim.

And, the runny RTV windshield sealer would be maybe even better than gasket sealer as it gets into every nook and cranny then sets up pretty well. I used it on the windshield of Dad's '81, but didn't have any handy when this project came up.