I squeezed some 0.5" conduit to make a snugly-fitting extension to my 3/8" ratchet:
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I was then able to use that with the 19mm flared crowsfoot to loosen the flexible line fitting, while holding down the accumulator with a 17mm wrench, with a temporary pipe extension. The helpful thing here is that the flared crowsfoot, and the snug extension, can hang by themselves from the fitting, while you get ready with the other wrench. After removing that fitting, I was able to remove the hard-line fitting using a 17mm 'normal' crowsfoot (with the extension ratchet), while holding the accumulator with a 14mm wrench, with the temporary extension.
However, I'm still stuck with the ferrule that won't come loose from the fitting:
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Although I can attach the fitting to the new accumulator, I'm a little concerned that unless I unstick the ferrule to allow it to reseat into the fitting and line, that I will have leaks. Any thoughts?
Robert