Glowforge tube Bar knocking

Hello, so today I turned my glowforge on and it starting making a banging noise. I. watched it for a few minutes and noticed the left side of the bar that the tube is in is hitting the backside of the machine where the other side isn’t. Its never done this before. I checked all the belts and I’m not seeing anything.

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Turn the GF off and pull the gantry all the way forward (on both sides), then push all the way back (on both sides). After you have done this restart the machine and see if that has realigned the sides.

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Thanks

did you find a solution to this issue? Mine has just done the exact same issue