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When I looked to the Support questions. It said I was to remove a top magnetic piece from the laser so that I could check the Z axis, and unplug it and plug it back in for confirmation. There is a front magnetic cover on my machine, but the top cover does not seem to be magnetic. if I jiggle it back-and-forth it does not release and I do not want to break my machine. Is there another way that this comes off?