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The leather primer seals do seal well, I could hear a positive "squirt" when I pressed the plunger.
I wouldn’t be surprised if the needle and seat were lapped to fit at the factory, but I also saw the instructions not to lap them with valve grinding compound. That makes sense, it would be too coarse and would cause fuel leakage, but I wonder if something like baking soda or toothpaste could help ensure a good seal.
The needle that is in there now is well cleaned, as is the seat, but it has ridges that can be felt with a fingernail about halfway down the taper. The seat is also clean, but it’s difficult to evaluate. I’ll drain the carb again tomorrow, pull the cap, and drop the needle to see what else I can do. The N.O.S. one won’t be here for a week anyhow so if I can’t fix it with what I have, it’ll be too late.
Heck, it’s only quarter to eleven. I’ll go out and pull it now.