I removed bottom cover and roller brush and top cover to access the actuator arm. Removed and replaced it. To replace the cable, I had to remove the vacuum head to remove the old cable and insert the new one. After reassembly, I adjusted the cable on the actuator arms for best performance.
The vacuum cleaner self-propelled function now works as good as it did when the unit was new.
Obtaining the parts from you was very easy and fast.