Rigidhead
Thank you for that - we have robbed the blades of another which needs an engine change and some sheet metal work. Shuffle has gone now. We have packed up the blades and they are now on the way to Singapore to a blade repair shop called Composite Technology. Hopefully should get them back before the other one we robbed gets fixed!
So the shuffling is just a aerodynamic effect of the blades moving in the root sleeve. Would this be mainly in drag plane or flapping plane?