LOL, cue: «shimming» 😉
edit: hey, we're talking about a LEICA, not some Fed or Zorki! 😀
Also cue <<focus shift>> 😉
You think Leica is immune to register problems?
I know a guy who bought a like new Leica MP (s/n was very late > 397xxxx) at a shop in Tokyo and then got it checked over by Leica Japan. They told him the mount was off and it had to go back to Germany for repair. He returned the camera instead. And despite knowing the mount was off, the shop promptly put the camera back on the shelf and sold it 😱