After looking at parts diagrams and the brake disc on the 169, it looks like the PO bolted the disc snugly to the release lever and never used a spring. I think that the spring must go between the back (concave) side of the disc and the release lever. That way, when the operator starts to disengage the clutch, the spring starts taking up some of the pressure and wear on the face of the disc until the clutch is finally disengaged. Kinda like the difference between gently applying the brakes on a car or truck and slamming the brake pedal hard. And that would also explain why there is no brake material left on the face of the disc on my tractor. Anyway, I'm going to try it as soon as the parts arrive and will see what happens. Stay tuned.
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