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April 18, 2020 at 7:17 pm
#200479
This is a long (very long!) shot but is there ANY chance that the slow speed needle was replaced at some point with an incorrect one? There are many different ones and sometimes people damage one by dropping it (bending/blunting the tip) and then they replace it with one that is not exactly the same…..
When you have the welch plug out you should be able to see the tip of the needle poking through the hole when it is fully screwed in.
They don’t have part numbers on them either; makes it hard to know what you have sometimes.
Good luck!