Thanks for the explanation, Job. I didn't see that part of your Twitter post (I guess I don't know hoow to use Twitter and Facebook). Those rubber mounts are actually a big deal. They are there to reduce microphonic disturbances from the fan from getting to the OCXO and anything else that might respond to the shaking.
The top thing that annoys me about the 8340 (and 8566), its the fan noise. It's well worth fixing that problem, especially since these instruments won't be running at 55C here (that's the rating the fan was designed for).
Vladan
