BTW, I fund the leak, it was inside the joint of the stainless steel flex and the copper end.
So I used a Harris 45% silver rod.
My problem was the regulator I have in my little 1/2mt nitrogen cylinder is a piece of garbage and I have to struggle to get over 300psi out of it.
So, next in my "to do" list is to get a better nitrogen regulator and after that a bigger cylinder, I'm getting tired to recharge it twice in a week.
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