OK, I've seen that video - it was made when the rotary was just in Beta, so the setting up is different - and it had a lot of 'quirks' then, as mentioned in the video, and I also had a look at the 'toothpick' video mentioned. None of these provide any assistance with this issue, unfortunately, nor have several others I've looked at, hough none are very recent. It would be good if I could get a simple model sent that works for comparison, perhaps, or I can send mine somehow(?)