I knew this would be trouble when I read about it. The control cables are supported by cushion clamps. There’s a layer of thick rubber made from a scrap of cooling hose. (I think it’s to keep the axis of the control roughly centered with the knob itself.) It’s impossible for me to contort myself to be able to get under the panel and work, so these were installed (and photographed!) blindly.
upside down view of control cable supports