Medium problem alternator to expand !

Hello! I ,wanted to expand on WE the Lima ,da camp noises ! I had to find out that the full post in the workshop has damaged the thread of a bore ! This is the holder ,if you stand in front of the car and look at the Lima ! ! Unfortunately is warranty after 2 years around ! Named , plug nut turns into the void ! Now I did not want to destroy the Lima ,but have it repaired ( Rep. ca. 50€) What possibility there is still to get this screw out ,because place ,is not really there ! Thank you in advance !