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I removed all four corner screws from my shower door in order to adjust sag. Unfortunately whatever is inside the door pulled away from the holes and now I can no longer reinstall the screws that I removed. Anyway that I can fix this? enter image description here

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  • lay the door on the floor or on a large table ... take the frame apart and examine the corners very closely ... you should be able to determine what the screws thread into – jsotola Dec 28 '20 at 5:02
  • There may be a sliding steel nut in there - try turning the door end over end and see if you can hear something sliding around in the frame. You might be able to get it to slide back where it belongs. – Ted Mittelstaedt Dec 28 '20 at 8:59
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Inside the door frame is a tube like opening that runs the length of the frame. It is an integral part of the frame and is formed when the metal is extruded through a die.

The opening usually gets broken or is forced wider when the screw is turned to tight. Also corrosion occurs over time.

You can try this first: get a screw of the same diameter as the original, but slightly longer. You may be able to reach a sound section of the adjoining frame.

If not carefully separate the two miters until you can see an attachment point. This is not something that is easy and can be dangerous.

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  • The old screw might work. If you don't line these up just right it won't find the threads. – Mazura Dec 28 '20 at 11:49
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All you can do at this point is disassemble the door and line up the missing pieces. There will be some rubber gaskets around the glass that will have to be put back in place. Work on one corner at a time, secure it with the screw and then go to the next corner. when the four corners re assembled, tighten all four screws.

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