jjwithers wrote:
And this time I will use teflon. And re-do/repeat on the other side.
Hmmmmm,
Teflon tape is wonderful stuff, but I wouldn't use it for straight threads. I understand that teflon tape is intended for tapered threads, that is pipe threads or certain air or hydraulic fittings. Tapered threads will jam against each other as they are tightened, compressing the teflon between them, creating the seal.
With straight threads, however, compressing happens between two flat surfaces as the threads are tightened. And when a gasket is between the two flat surfaces, sealing happens. Teflon tape might work with straight threads, but you would really need to get the number of wraps just right so that the void is just filled. (Theoretically there is a spiral of air between the male and female straight threads.)
But before I resorted to teflon tape I would re-examine the gasket and metal surfaces again to make sure that there are no nicks, voids, or whatever might inhibit the seal. If I still couldn't get a good seal then I might wipe a very thin layer of grease or silicone on the surfaces and try again. With copper gaskets, you could try re-annealing them. Copper crush washers are intended for one use only, but I would try re-annealing one and see if it worked.
Either that or I don't understand how teflon tape is supposed to seal. And if teflon tape does fix the problem with straight threads, good deal! Never mind what I said.
Ken