The Concept One Belt story...
So, I asked my boss about this "belt flipping" thing today...
I was partially wrong, he had seen it first on Elites maybe 10-15 years ago; and on one or two Concept Ones here and there since then.
It was early Concepts that had belt displacement issues, not flipping issues.
The Elites that he saw it on were used by a local Merry Maids. They brought a cleaner in that it had happened to. He looked at it, and scratched his head... thought "oh, someone twisted it when they replaced the belt...." and told the people at Merry Maids to be extremely conscious of it the next time they replaced a belt. They were agreeable to that, and did such.
So, they came in a few days/weeks later, and the same thing had happened. Ok, a bit weird now. So, he took the belt off, and sent it back to the guy in charge of quality control in North Canton--told him about the problem. "Maybe it's an issue with the belt itself...?" No problem found with the belt.
So, it kept happening to these Merry Maids cleaners. Finally, my boss was just puzzled enough--and so was the guy in North Canton, that he had to "see it to believe it." So, the whole machine, twisted belt, and all... went back to North Canton for "evaluation". He said he wouldn't have believed it unless he was able to see it... but, again-- no obvious problem found.
And, this was really the first time that anyone in the QC department in North Canton had seen such a problem, or heard of such a problem.
The ultimate diagnosis, from quality control/engineering was that it was just the right set of circumstances... The cleaner was used for the right amount of time, the belt got to just the right temperature, maybe a rug or something was snagged--and stalled the agitator for just the right amount of time, maybe the cleaner got bumped into something.... whatever. "The stars were properly aligned." The belt had walked its way to the end of the armature shaft, flipped itself over once it got there, and walked back on the other way. And it did that multiple times, resulting in the multiple twists in the belt.
Althought I've never seen a bent armature on a Concept, nor was that the diagnosis on the Elites from QC in North Canton, I bet that the slightest bend in an armature could also have the same sort-of effect on a belt, making it not ride centered on the armature where it's supposed to ride.
Just one of those things.
**scratches head**
~Fred