I removed the end cap on my recently-purchased vintage Astoria Argenta to clean out the mini Carlsbad Caverns of stalagtites that had formed on the bottom of the boiler. When I pulled it, the original paper gasket broke into pieces. I ordered a replacement, noting that both paper and teflon were available as options. I went with teflon (in case someone has to do the same thing I did in twenty years.) Now I'm wondering why both paper and teflon are available, and if I might end up regretting the choice to go with teflon instead of the original paper gasket. Any advice on why there's a difference ?