Hi,
Where are you located? If in the US, have you contacted Leica USA (in New Jersey)? Other independent and reknown repairers in the US are Sherry Krauter at
Sherry Krauter.com -- Home of the Golden Touch.***, and Dan Goldberg (DAG Camera repairs) at
http://www.dagcameras.com
BTW, is this an issue with an M8 or with a film M ?