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The way I read the initial response about the o rings was that it is simply a good idea for what are probably 40-ish year old o rings to be replaced. It sure didn't seem to me to be written as an all inclusive how-to guide on how to replace them.
sre
P.S. - I will probably be sorry I stepped in at all because none of this banter about what he really, truly, in the weeds meant by his post does any good to the OP.
I guess you need some clarification, although if you were actually able to comprehend my first post, you would see that it was important information to try and keep someone from doing harm to their equipment. At no point did I say that they shouldn't be replaced. Go back and read. I was stating that a proper procedure needs to be followed and that had not previously been stated. I don't make random posts just so I can see my words in print. Everything I post has a reason. If the OP has no knowledge of AC procedure, he might take this "change the o-rings" suggestion and simply do so, without following up with a proper evacuation. If you consider that "splitting hairs", then so be it. I have only one purpose here and that is to absorb CORRECT information from others and to give the same CORRECT information that I possess.