The olive does a pretty good job of that.
Why would you want to replace a metal/metal seal with a metal/PTFE seal?
I just don't get this "use PTFE regardless" approach - I've made
hundreds of compression joints without PTFE tape on a single one, and
have yet to experience a problem.
At the risk of a further display of inexperience, doe the PTFE tape around a
bib tap thread fitting 'gunk' it up, meaning that I would not then be able
to unscrew and refix. It's just that this will govern whether I do this part
of the work sooner or later in the list.
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