Not that the rest still wouldn't be a pain, but a drop- in replacement for R-12 is available. It is compatible with the old oil in the system. Just evacuate (recover) and re-charge.
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
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