To One and All
It would pay to make sure that all your Bushes in the torque limters are in good shape, as we have come to the conclusion that some of them are getting quite worn and then getting in to a cyclic vibration and then breaking feeder shafts and such. When I removed our rear feeder reverser drive pulley (one with the chain reverser sprocket on it) I found lots of chain marks in the pulley!!! you will find that the pulleys on the torque limters have a couple of bushes in them that get worn and can cause the pulley to wobble!!! Check ALL Pulleys for any wobble and replace bushes if need be.
Rolf