Id not worry about the dot only Leica service centres and a few repair people ever bothered.
Originally Posted by Erik Petersson
If you want the camera for shooting a horizonial error is focus error a vertical error is distraction - at least. Setting the rfdr is difficult some of the service people don't bother much.
Lots of people set them on shelves in glass cases so there is a large premium on condition try to get a dinked shooter that has a 'bounce' noise at 1/15 and a clear and accurate rangefinder.
An 3rd party M service (not Leica factory) in London is 120 GBP ... a factory is kidney.