Neutral pen spring tip drip test appears to leak ink, is it more of an ink problem or a pen tip problem?

Spring-tipped ink drip test with ink leakage, the first problem is the pen tip. The spring in the spring-tipped pen acts as a one-way valve, topping the ball to close the gap. The spring has a straight section, the top of the ball ball bottom, if the position is not in the center, there may be offset, causing the ball bead offset, easy to produce dripping. Of course the ink performance will also have some impact.