My problem is that I have a button on which the locking slide does not work very well. I have cleaned it every way I can think of, short of taking out the ball detent thingy. Regular cleaning works for a couple of days, then it starts to stick again. I suspect the ball bearing part might bee the problem, I just can't get it out without brutal force.
Have not done it yet. Hope one of the 'experts' chime in. Good luck!