I recently had a 7 stop overshooting floors in both directions at all stops but top ,bottom , and 4th floor. I checked everything having to do with compounding and I thought I had checked everything having to do with selector. I checked pie plates, cable, bearings, sensors, etc and everything seemed fine. I finally realized the set screws at the end of the shaft with the pie plates were loose on the opposite end from the drum and the whole shaft had shifted maybe 3/16’s of an inch. Why it didn’t effect floors 1,4,and 6 was kind of misleading