The small sping has come out of the shaft from the motor.If you open the unit you will see that the motor has a little impeller and a shaft with a slot in it. The little spring inside of the massager head is suppose to ride inside of that motor shaft with the little tab on the spring lining up in the slot. It's really flimsy and after I fixed mine it fell out again after 5 minutes of use. It needed a stiffer spring or a different way of engaging the motor shaft. I'm still working on this...
I just watched a video on Youtube which show somebody who just dismantled the whole thing...I then realized what was happening. I think I let mine run too long and it got very hot which caused the metal hammer inside of the head to not move smoothly or freely which in turn caused the small spring to bind and just coil up. Solution I removed the 4 screws from the head (without dismantling it any further) and minorly spread the two sides of the head with a flat head screw driver. I then held over the garbage can and sprayed a load of WD-40 inside. Bingo! I could turn the spring very easily now and hear the hammer moving freely inside of the head. I ran it for half an hour and all is well. In hind sight, I might have considered some kind of graphite or silicone spray as a potential longer lasting metal to metal lubricant. And of course do not forget to put the 4 screws back in!
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