I don't know about 'correct' but I was able to loosen the alternator mounting bolts and the alternator slipped out pretty easily. Then to reinstall, I put the belt around the alternator and leveraged it into place with a bar. Inserted the mounting bolts and tightened. Worked for me. YMMV.

__________________
Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon