Stealth, I noticed my armrest lid had a slight amount of play in it, but only when the rest was slid in. At full extension, there's no noise. When it's pushed in, I get a knock & slight rocking when I rest my elbow.
So, I asked the stealer to look while it was serviced. Predictably they drew a blank. So while deep cleaning the interior last week I stripped off the armrest lid.
The lid slides back & forth on two metal tubes. There are two circular white plastic bushings that these tubes run through. This entire assembly is on the underside of the rest. First I wondered if the four lugs that mount the rest to the base of the armrest were developing any play. So a bit of fluffy self adhesive velcro to pack out the fitting was applied. No difference.
Looking at the metal tubes, I noticed that the right side white bushing had developed a small amount of play. It was this that causes the lid to knock when leant on. After a year, my armrest lid is essentially rattly, and unfixable. New lid required.
So the point of this long rambling tale is to ask you whether the gap may be due to the same?