If that's a RevE machine , the heated bed plate under the glass is supposed to rest on four very small black screws that sit very tight against the rubber brackets, and it's possible if you are not careful to evenly space the heated bed plate when you put it into the brackets, to miss one of those ...

1. My entire X frame that holds my bed is getting really wobbly. The the rail and everything else appears sturdy, it's somewhere between the rail connection and the X frame itself. It is NOT the print bed or heat plate. Can you point me to the right place to tighten this up (picture would be immense...