thanks to kennyandco for your responce. cushin bolts have been investigated and are o.k. this problem has stumped even the local mercedes dealer! the odd thing to me is that after 1 year and 30k the symtems and magnitude of the vibration have not changed. surely someone has traveled this same road befor. i sell used highline vehicles (northhillsauto.com) and have seen this same problem in lesser degrees.
hopefully , ken gamble