[MBZ] mirror glass removal

[Jerry Herrman]

The glass is broken on the driver side mirror on my 82 240D (123 body 
style). I have been told that I can replace the glass mirror without 
removing the mirror housing.  Is this true? Has anyone actually done this 
who can tell me how to remove the broken glass mirror and replace it with 
one removed from another mirror housing ?

Thanks in advance
Jerry
82 240D