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I have seen the headloaders deform as yug says, but on inspection the wiffle balls had started to develop a crack near the screw which holds them to the arm. After replacemnet they no longer deformed. I always check them out now and also look at them through a sky tack any signs of deforming and they are spooled down and replaced. The resonance can be alarming if you fix the heli to the ground so I let it run free. Also the slight inbalance puts a bit more strain on the parts than normal running would, after running the headloaders I then retire home and inspect the airframe for any probs and go round the bolts one more time.
As with all moving parts keep a good distance away from it while you run them up and you will be fine.
For run in I use them to get a couple of tanks through and establish the basic settings then I go out and fly the rest of the run in in the air,fuel is far to expensive to waste on the ground for too long.