Ball nose spring plungers are the best type of spring-loaded ball plungers for press-fit ball plunger. They have a ball on the end of the plunger that fits into a hole in the ball, and they are designed to be pushed down with a press. The ball nose spring plunger is pushed down with a force that is greater than the force required to push the ball down into the hole, so that the ball stays in place and does not pop out. The spring loaded plunger is also less likely to damage the ball when it is removed from the press.