I think a screw might be missing. Or, just some of the details, aren't placed the right way. Either way, you need to solve the problem, not to get worse. You can try searching for toggle clamps, a good starting point. If you have no idea what these are, check sandfieldengineering.com. You can find here everything about the. Maybe in this way, you'll discover what's wrong, and you will be able to fix it. If you can't solve this on your own, I guess the only option is to go to a specialist and let him take care of it.
