BORGESON steering box

Just an update: I sent the video to Borgeson and they still believe it is the coupler:

"That is a known issue with the Bergman coupler. Definitely noise transfer through the column."

I'd hate to go through all of the trouble and expense of swapping out the coupler, but I'm not going to be able to live with this noise. I'll be watching this thread closely for additional info or suggestions...