This fix involves replacing the set knob on the saw-fence with a camlock/quick-release locking system from a bicycle. This is to replace the original steel bolt/brass and plastic knob combo. I understand the need to have brass on steel locking, and I can also say that replacing the original knob with a new Festool knob is not expensive, but my fix makes this a little better and easier to work with.
Brass in plastic knob stripped out after years of loosening and tightening (and over-tightening). The actual strip occurred on a day when it was suddenly a lot colder than the previous day, so who knows, the temperature difference may have had some influence on the whole process.