I just bought an EMag and the ball that detents (can detent be a verb?) the selector's cam is apparently corroded down so that it doesn't do its job. There was also a spring on the top side of the cam when I took it apart, in the hole that's apparently for installing the spring and ball. Does anyone have any ideas on how to get the ball out, or loosen it? If I need a new one, its not a big deal, but its stuck down in there pretty tight, and I'm wondering whether there was a spring under it based on the spring on top.