Here's a common issue with Gibson Deluxe tuners.  The tuner button shafts eventually work against the tuner housing and loosen up the back cover.  These covers have metal tabs that are pressed into the base plate and then deformed to lock in with a mechanical connection (similar to a rivet).  I have tried soldering these tabs in the past but they never seem to hold for very long.  This time I tried a flat screwdriver and a hammer to punch the tab and reform it to hold in to the base plate.  We'll see how long this method will work. I may try a combination of this and soldering on future repairs.  See the video below from the daily vlog.