I have had also that problem when I rebuild my CGT 216 engine.
If you still have the small fitting you can reuse it without any problem. You have to grind carefully and slowly until you can get the cooper pipe out of it. This pipe is not impossible to find. You could find it in a automotive spares shop, or lawn machine repair shop, a brake repair shop. If you can obsolutely not find it, let me know.
After puting a new pipe inside the fitting, you screw it carefully in the engine block head, and the fitting will be squezed and will seal hermeticaly again.
Eric Delcommenne
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