Yes, our 107's as well as my 124 sedan use a ball bearing w/ mainspring setup. Not sure on the new ones .kbflorida - 9/13/2005 9:22 PM
don't know about the newer benz but I had the same struggle on my 76 450sl.
turned out the whole mirror assemble (with stem) comes out - it just fits in the top with a kind of pressure clip mechanism. But it really seemed bolted on at first, until I pulled at the right angle and it popped right out.
I just held the stem - not the mirror - firmly, and pulled.
But again, yours may be different.