steering vibration

[RGuzz]

Looks like time to check myself. Steering vibration continues, my Bosch
place again tells me there is nothing wrong and that there is no
steering dampener in this car and perhaps the vibration is in the
steering box someplace. I know it isn't wheel related. Right under your
hands while interstate driving. Airbag has been tightened and presumably
has no play accounting for this. The possibilities are essentially
endless, I guess. Any suggestions to narrow the field? Do I need to
locate the steering dampener myself? The car is perfect otherwise,
making this a real annoyance.
Thanks,
Rich